Fixed Bug #69479 GD fails to build with newer libvpx

From upstream libgd/libgd@d41eb72

Fix build with latest libvpx 1.4.0

These new constants exist at least since 1.0.0
Compatibility ones have been droped in 1.4.0

Author: remicollet

ext/gd/libgd/webpimg.c

@@ -706,14 +706,14 @@ static WebPResult VPXEncode(const uint8* Y,
     codec_ctl(&enc, VP8E_SET_STATIC_THRESHOLD, 0);
     codec_ctl(&enc, VP8E_SET_TOKEN_PARTITIONS, 2);
 
-    vpx_img_wrap(&img, IMG_FMT_I420,
+    vpx_img_wrap(&img, VPX_IMG_FMT_I420,
                  y_width, y_height, 16, (uint8*)(Y));
-    img.planes[PLANE_Y] = (uint8*)(Y);
-    img.planes[PLANE_U] = (uint8*)(U);
-    img.planes[PLANE_V] = (uint8*)(V);
-    img.stride[PLANE_Y] = y_stride;
-    img.stride[PLANE_U] = uv_stride;
-    img.stride[PLANE_V] = uv_stride;
+    img.planes[VPX_PLANE_Y] = (uint8*)(Y);
+    img.planes[VPX_PLANE_U] = (uint8*)(U);
+    img.planes[VPX_PLANE_V] = (uint8*)(V);
+    img.stride[VPX_PLANE_Y] = y_stride;
+    img.stride[VPX_PLANE_U] = uv_stride;
+    img.stride[VPX_PLANE_V] = uv_stride;
 
     res = vpx_codec_encode(&enc, &img, 0, 1, 0, VPX_DL_BEST_QUALITY);