Fix symbol version compat wrappers on systems with export prefixes

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@23615 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/internal.h

@@ -198,11 +198,11 @@
 
 #if HAVE_SYMVER_ASM_LABEL
 #   define FF_SYMVER(type, name, args, ver)                     \
-    type ff_##name args __asm__ (#name "@" ver);        \
+    type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \
     type ff_##name args
 #elif HAVE_SYMVER_GNU_ASM
 #   define FF_SYMVER(type, name, args, ver)                             \
-    __asm__ (".symver ff_" #name "," #name "@" ver);    \
+    __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \
     type ff_##name args;                                                \
     type ff_##name args
 #endif