avserver: Remove unused loadable module support

There is no record of this ever being used at all, anywhere,
since the feature was added in 2effd274.

This gets rid of extra linker tricks just to support a feature
that isn't used, simplifying portability to other platforms.
Signed-off-by: Martin Storsjö <martin@martin.st>

avserver.c

@@ -58,9 +58,6 @@
 #include <time.h>
 #include <sys/wait.h>
 #include <signal.h>
-#if HAVE_DLFCN_H
-#include <dlfcn.h>
-#endif
 
 #include "cmdutils.h"
 
@@ -3914,32 +3911,6 @@ static enum AVCodecID opt_video_codec(const char *arg)
     return p->id;
 }
 
-/* simplistic plugin support */
-
-#if HAVE_DLOPEN
-static void load_module(const char *filename)
-{
-    void *dll;
-    void (*init_func)(void);
-    dll = dlopen(filename, RTLD_NOW);
-    if (!dll) {
-        fprintf(stderr, "Could not load module '%s' - %s\n",
-                filename, dlerror());
-        return;
-    }
-
-    init_func = dlsym(dll, "avserver_module_init");
-    if (!init_func) {
-        fprintf(stderr,
-                "%s: init function 'avserver_module_init()' not found\n",
-                filename);
-        dlclose(dll);
-    }
-
-    init_func();
-}
-#endif
-
 static int avserver_opt_default(const char *opt, const char *arg,
                        AVCodecContext *avctx, int type)
 {
@@ -4596,12 +4567,7 @@ static int parse_ffconfig(const char *filename)
                 redirect = NULL;
             }
         } else if (!av_strcasecmp(cmd, "LoadModule")) {
-            get_arg(arg, sizeof(arg), &p);
-#if HAVE_DLOPEN
-            load_module(arg);
-#else
-            ERROR("Module support not compiled into this version: '%s'\n", arg);
-#endif
+            ERROR("Loadable modules no longer supported\n");
         } else {
             ERROR("Incorrect keyword: '%s'\n", cmd);
         }

configure

@@ -1974,7 +1974,6 @@ enable dxva2 vdpau
 
 # build settings
 SHFLAGS='-shared -Wl,-soname,$$(@F)'
-AVSERVERLDFLAGS=-Wl,-E
 LIBPREF="lib"
 LIBSUF=".a"
 FULLNAME='$(NAME)$(BUILDSUF)'
@@ -3059,7 +3058,6 @@ case $target_os in
         host_libs=
         ;;
     sunos)
-        AVSERVERLDFLAGS=""
         SHFLAGS='-shared -Wl,-h,$$(@F)'
         enabled x86 && SHFLAGS="-mimpure-text $SHFLAGS"
         network_extralibs="-lsocket -lnsl"
@@ -3104,7 +3102,6 @@ case $target_os in
         SLIBSUF=".dylib"
         SLIBNAME_WITH_VERSION='$(SLIBPREF)$(FULLNAME).$(LIBVERSION)$(SLIBSUF)'
         SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME).$(LIBMAJOR)$(SLIBSUF)'
-        AVSERVERLDFLAGS=-Wl,-bind_at_load
         objformat="macho"
         enabled x86_64 && objformat="macho64"
         enabled_any pic shared ||
@@ -3196,7 +3193,6 @@ case $target_os in
         add_cppflags -D_GNU_SOURCE
         add_ldflags -Zomf -Zbin-files -Zargs-wild -Zmap
         SHFLAGS='$(SUBDIR)$(NAME).def -Zdll -Zomf'
-        AVSERVERLDFLAGS=""
         LIBSUF="_s.a"
         SLIBPREF=""
         SLIBSUF=".dll"
@@ -3236,7 +3232,6 @@ case $target_os in
         ;;
     osf1)
         add_cppflags -D_OSF_SOURCE -D_POSIX_PII -D_REENTRANT
-        AVSERVERLDFLAGS=
         ;;
     minix)
         ;;
@@ -4120,7 +4115,6 @@ LD_LIB=$LD_LIB
 LD_PATH=$LD_PATH
 DLLTOOL=$dlltool
 LDFLAGS=$LDFLAGS
-LDFLAGS-avserver=$AVSERVERLDFLAGS
 SHFLAGS=$(echo $($ldflags_filter $SHFLAGS))
 YASMFLAGS=$YASMFLAGS
 BUILDSUF=$build_suffix