Revert 4 commits to configure which broke dependency handling

Revert "configure: Don't enable examples when --disable-everything is used"
reverted as the problematic commit will be reverted too
This reverts commit 02dfa64c.

Revert "Merge commit 'a2bb771a'"
This reverts commit e8ebcb00, reversing
changes made to 3bff005b.

Revert "Merge commit '21c750f2'"
This reverts commit 470bfab4, reversing
changes made to f97ee815.

Revert "Revert "configure: Revert recent changes to disable-everything""
This reverts commit f97ee815.
Reviewed-by: Hendrik Leppkes <h.leppkes@gmail.com>
Immediate commit suggested by BBB

configure

@@ -579,15 +579,8 @@ enable(){
     set_all yes $*
 }
 
-check_requested() {
-    for var; do
-        eval test "x\$${var#!}_requested" = "xyes" &&  die "${var%%_*} cannot be enabled"
-    done
-}
-
 disable(){
     set_all no $*
-    check_requested $*
 }
 
 enable_weak(){
@@ -638,32 +631,6 @@ enable_deep_weak(){
     done
 }
 
-do_enable_deep_force(){
-    for var; do
-        enabled $var && continue
-        eval sel="\$${var}_deps\ \$${var}_deps_any\ \$${var}_select\ \$${var}_suggest\ \$${var}_select_any"
-        pushvar var
-        enable_deep_force $sel
-        popvar var
-    done
-}
-
-enable_deep_force(){
-    do_enable_deep_force $*
-    for var; do
-        is_in $var $ALL_COMPONENTS $COMPONENT_LIST $LIBRARY_LIST && enable $var
-    done
-}
-
-request(){
-    disable $* # force the refresh of the dependencies
-    for var; do
-        enable ${var}_requested
-    done
-    enable_deep_force $*
-    enable $*
-}
-
 enabled(){
     test "${1#!}" = "$1" && op='=' || op=!=
     eval test "x\$${1#!}" $op "xyes"
@@ -723,7 +690,7 @@ do_check_deps(){
         append allopts $cfg
 
         eval dep_all="\$${cfg}_deps"
-        eval dep_any="\$${cfg}_deps_any\ \$${cfg}_select_any"
+        eval dep_any="\$${cfg}_deps_any"
         eval dep_sel="\$${cfg}_select"
         eval dep_sgs="\$${cfg}_suggest"
         eval dep_ifa="\$${cfg}_if"
@@ -2860,7 +2827,7 @@ tls_schannel_protocol_deps="schannel"
 tls_schannel_protocol_select="tcp_protocol"
 tls_securetransport_protocol_deps="securetransport"
 tls_securetransport_protocol_select="tcp_protocol"
-tls_protocol_select_any="tls_schannel_protocol tls_securetransport_protocol tls_gnutls_protocol tls_openssl_protocol"
+tls_protocol_deps_any="tls_schannel_protocol tls_securetransport_protocol tls_gnutls_protocol tls_openssl_protocol"
 udp_protocol_select="network"
 udplite_protocol_select="network"
 unix_protocol_deps="sys_un_h"
@@ -3047,7 +3014,10 @@ cpu="generic"
 intrinsics="none"
 
 # configurable options
+enable $PROGRAM_LIST
 enable $DOCUMENT_LIST
+enable $EXAMPLE_LIST
+enable $(filter_out avresample $LIBRARY_LIST)
 enable stripping
 
 enable asm
@@ -3168,6 +3138,12 @@ ALL_COMPONENTS="
     $PROTOCOL_LIST
 "
 
+for n in $COMPONENT_LIST; do
+    v=$(toupper ${n%s})_LIST
+    eval enable \$$v
+    eval ${n}_if_any="\$$v"
+done
+
 enable $ARCH_EXT_LIST
 
 die_unknown(){
@@ -3234,11 +3210,10 @@ for opt do
             disable $PROGRAM_LIST
         ;;
         --disable-everything)
-            map 'eval disable \${$(toupper ${v%s})_LIST}' $COMPONENT_LIST
-            enable_deep_force $(filter_out avresample $LIBRARY_LIST) $PROGRAM_LIST
+            map 'eval unset \${$(toupper ${v%s})_LIST}' $COMPONENT_LIST
         ;;
         --disable-all)
-            map 'eval disable \${$(toupper ${v%s})_LIST}' $COMPONENT_LIST
+            map 'eval unset \${$(toupper ${v%s})_LIST}' $COMPONENT_LIST
             disable $LIBRARY_LIST $PROGRAM_LIST doc
             enable avutil
         ;;
@@ -3255,7 +3230,6 @@ for opt do
             is_in "${thing}s" $COMPONENT_LIST || die_unknown "$opt"
             eval list=\$$(toupper $thing)_LIST
             name=$(echo "${optval}" | sed "s/,/_${thing}|/g")_${thing}
-            test $action = enable && action="request"
             list=$(filter "$name" $list)
             [ "$list" = "" ] && warn "Option $opt did not match anything"
             $action $list
@@ -3263,10 +3237,9 @@ for opt do
         --enable-?*|--disable-?*)
             eval $(echo "$opt" | sed 's/--/action=/;s/-/ option=/;s/-/_/g')
             if is_in $option $COMPONENT_LIST; then
-                test $action = enable && action="enable_deep_force"
+                test $action = disable && action=unset
                 eval $action \$$(toupper ${option%s})_LIST
             elif is_in $option $CMDLINE_SELECT; then
-                test $action = enable && action="request"
                 $action $option
             else
                 die_unknown $opt
@@ -3303,15 +3276,11 @@ done
 
 disabled logging && logfile=/dev/null
 
-# Enable the default components if not disabled explicitly
-
-enable_weak $(filter_out avresample $LIBRARY_LIST) $PROGRAM_LIST
-
 # Disable all the library-specific components if the library itself
 # is disabled, see AVCODEC_LIST and following _LIST variables.
 
 disable_components(){
-    disabled ${1} && disable_weak $(
+    disabled ${1} && disable $(
         eval components="\$$(toupper ${1})_COMPONENTS"
         map 'eval echo \${$(toupper ${v%s})_LIST}' $components
     )
@@ -3319,25 +3288,6 @@ disable_components(){
 
 map 'disable_components $v' $LIBRARY_LIST
 
-echo "# $0 $FFMPEG_CONFIGURATION" > $logfile
-
-# Mark components that had not been enabled/disabled explicitly
-# as enabled
-
-for n in $COMPONENT_LIST; do
-    v=$(toupper ${n%s})_LIST
-    eval enable_weak \$$v
-    eval ${n}_if_any="\$$v"
-done
-
-# Make so that disabled libraries are enabled if a component
-# of them is requested
-
-for n in $LIBRARY_LIST; do
-    v=$(toupper ${n})_COMPONENTS
-    eval ${n}_if_any="\$$v"
-done
-
 echo "# $0 $FFMPEG_CONFIGURATION" > $logfile
 set >> $logfile