Restore _MSC_VER case in DECLARE_ALIGNED/DECLARE_ASM_CONST macro declaration.

This compiler might be supported in the future or we might some day decide
to export these macros.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@16786 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/internal.h

@@ -264,6 +264,9 @@ if((y)<(x)){\
 #elif defined(__GNUC__)
     #define DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))
     #define DECLARE_ASM_CONST(n,t,v)    static const t v attribute_used __attribute__ ((aligned (n)))
+#elif defined(_MSC_VER)
+    #define DECLARE_ALIGNED(n,t,v)      __declspec(align(n)) t v
+    #define DECLARE_ASM_CONST(n,t,v)    __declspec(align(n)) static const t v
 #elif HAVE_INLINE_ASM
     #error The asm code needs alignment, but we do not know how to do it for this compiler.
 #else