lavu: move LOCAL_ALIGNED from internal.h to mem_internal.h

That is a more appropriate place for it.

libswscale/ppc/swscale_ppc_template.c

@@ -21,6 +21,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/mem_internal.h"
+
 static void FUNC(yuv2planeX_8_16)(const int16_t *filter, int filterSize,
                                   const int16_t **src, uint8_t *dest,
                                   const uint8_t *dither, int offset, int x)

libswscale/ppc/swscale_vsx.c

@@ -28,6 +28,7 @@
 #include "libswscale/swscale_internal.h"
 #include "libavutil/attributes.h"
 #include "libavutil/cpu.h"
+#include "libavutil/mem_internal.h"
 #include "yuv2rgb_altivec.h"
 #include "libavutil/ppc/util_altivec.h"