Sync with upstream: ext/gd

Author: petk

cmake/ext/gd/CMakeLists.txt

@@ -239,7 +239,6 @@ if(NOT PHP_EXT_GD_EXTERNAL)
       libgd/gd_io.c
       libgd/gd_jpeg.c
       libgd/gd_matrix.c
-      libgd/gd_pixelate.c
       libgd/gd_png.c
       libgd/gd_rotate.c
       libgd/gd_security.c