compat/avisynth: Fix unicode compilation.

Reviewed-by: Stephen Hutchinson <qyot27@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

compat/avisynth/avisynth_c.h

@@ -1096,7 +1096,7 @@ AVSC_INLINE AVS_Library * avs_load_library() {
   AVS_Library *library = (AVS_Library *)malloc(sizeof(AVS_Library));
   if (library == NULL)
     return NULL;
-  library->handle = LoadLibrary("avisynth");
+  library->handle = LoadLibraryA("avisynth");
   if (library->handle == NULL)
     goto fail;