Fix compilation warnings on platforms without Imlib2.

src/aafire.c

@@ -96,7 +96,7 @@ initialize (void)
 {
   int i;
 #ifdef LIBCACA
-  unsigned int r[256], g[256], b[256], a[256];
+  uint32_t r[256], g[256], b[256], a[256];
 #endif
 
 #ifdef LIBCACA

src/common-image.c

@@ -75,7 +75,7 @@ struct image * load_image(char const * name)
 
 #else
     /* Try to load a BMP file */
-    unsigned int red[256], green[256], blue[256], alpha[256];
+    uint32_t red[256], green[256], blue[256], alpha[256];
     unsigned int i, colors, offset, tmp, planes;
     caca_file_t *f;