Make DECLARE_ALIGNED macros work with external array specifiers

The macro implementation might need the name of the variable being
declared for compiler-specific syntax.  Moving array specifiers outside
the macro invocation allows this to work.

Originally committed as revision 21363 to svn://svn.ffmpeg.org/ffmpeg/trunk
(cherry picked from commit 8a24e98d50)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

libavutil/internal.h

@@ -256,11 +256,11 @@ if((y)<(x)){\
 }
 
 #if defined(__ICC) || defined(__SUNPRO_C)
-    #define DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))
+    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
     #define DECLARE_ASM_CONST(n,t,v)    const t __attribute__ ((aligned (n))) v
 #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)))
+    #define DECLARE_ALIGNED(n,t,v)      t __attribute__ ((aligned (n))) v
+    #define DECLARE_ASM_CONST(n,t,v)    static const t attribute_used __attribute__ ((aligned (n))) v
 #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