Merge branch 'PHP-7.4'

* PHP-7.4:
  Fix #78849: GD build broken with -D SIGNED_COMPARE_SLOW

Author: cmb69

ext/gd/libgd/gd_gif_out.c

@@ -548,7 +548,7 @@ compress(int init_bits, gdIOCtxPtr outfile, gdImagePtr im, GifCtx *ctx)
     output( (code_int)ctx->ClearCode, ctx );
 
 #ifdef SIGNED_COMPARE_SLOW
-    while ( (c = GIFNextPixel( im )) != (unsigned) EOF ) {
+    while ( (c = GIFNextPixel( im, ctx )) != (unsigned) EOF ) {
 #else /*SIGNED_COMPARE_SLOW*/
     while ( (c = GIFNextPixel( im, ctx )) != EOF ) {  /* } */
 #endif /*SIGNED_COMPARE_SLOW*/