Don't use -fvisibility if it generates warnings ... like this one:

warning: visibility attribute not supported in this configuration; ignored

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402688

configure.in

@@ -833,7 +833,7 @@ CheckVisibilityHidden()
 
     visibility_CFLAGS="-fvisibility=hidden"
     save_CFLAGS="$CFLAGS"
-    CFLAGS="$save_CFLAGS $visibility_CFLAGS"
+    CFLAGS="$save_CFLAGS $visibility_CFLAGS -Werror"
     AC_TRY_COMPILE([
     #if !defined(__GNUC__) || __GNUC__ < 4
     #error SDL only uses visibility attributes in GCC 4 or newer