msvc/icl: Use __declspec(deprecated)

Prior to this on msvc/icl there was no handling of deprecated functions
and the deprecated warning was disabled.

After enabling there are a number of warnings relating to the CRT and
the use of the non-secure versions of several functions.  Defining
_CRT_SECURE_NO_WARNINGS silences these warnings.
Signed-off-by: Martin Storsjö <martin@martin.st>

configure

@@ -2417,7 +2417,7 @@ msvc_flags(){
             -Wall)                echo -W4 -wd4244 -wd4127 -wd4018 -wd4389     \
                                        -wd4146 -wd4057 -wd4204 -wd4706 -wd4305 \
                                        -wd4152 -wd4324 -we4013 -wd4100 -wd4214 \
-                                       -wd4996 -wd4273 ;;
+                                       -wd4273 ;;
         esac
     done
 }
@@ -2641,7 +2641,7 @@ probe_cc(){
         _ld_lib='lib%.a'
         _ld_path='-libpath:'
         _flags='-nologo'
-        _cflags='-D_USE_MATH_DEFINES -Dinline=__inline -FIstdlib.h -Dstrtoll=_strtoi64'
+        _cflags='-D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -Dinline=__inline -FIstdlib.h -Dstrtoll=_strtoi64'
         if [ $pfx = hostcc ]; then
             append _cflags -Dsnprintf=_snprintf
         fi
@@ -4019,6 +4019,7 @@ elif enabled_any msvc icl; then
     enabled x86_32 && disable aligned_stack
     enabled_all x86_32 debug && add_cflags -Oy-
     enabled debug && add_ldflags -debug
+    enable pragma_deprecated
     if enabled icl; then
         # basically -fstrict-aliasing that does not work (correctly) on icl 13.x
         check_cpp_condition "windows.h" "__ICL < 1300" && add_cflags -Qansi-alias

libavutil/attributes.h

@@ -72,6 +72,8 @@
 
 #if AV_GCC_VERSION_AT_LEAST(3,1)
 #    define attribute_deprecated __attribute__((deprecated))
+#elif defined(_MSC_VER)
+#    define attribute_deprecated __declspec(deprecated)
 #else
 #    define attribute_deprecated
 #endif

libavutil/internal.h

@@ -62,8 +62,16 @@
 #endif
 
 #if HAVE_PRAGMA_DEPRECATED
-#    define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
-#    define FF_ENABLE_DEPRECATION_WARNINGS  _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
+#    if defined(__ICL)
+#        define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
+#        define FF_ENABLE_DEPRECATION_WARNINGS  __pragma(warning(pop))
+#    elif defined(_MSC_VER)
+#        define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
+#        define FF_ENABLE_DEPRECATION_WARNINGS  __pragma(warning(pop))
+#    else
+#        define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
+#        define FF_ENABLE_DEPRECATION_WARNINGS  _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
+#    endif
 #else
 #    define FF_DISABLE_DEPRECATION_WARNINGS
 #    define FF_ENABLE_DEPRECATION_WARNINGS