Drop unused GD defines

These are not used in the bundled libgd, and not used in config.m4
either.

Closes GH-7681.

Author: cmb69

ext/gd/config.w32

@@ -57,37 +57,18 @@ if (PHP_GD != "no") {
 		AC_DEFINE('HAVE_LIBGD', 1, 'GD support');
 		ADD_FLAG("CFLAGS_GD", " \
 /D PHP_GD_EXPORTS=1 \
-/D HAVE_GD_DYNAMIC_CTX_EX=1 \
 /D HAVE_GD_BUNDLED=1  \
-/D HAVE_GD_GD2  \
-/D HAVE_GD_GIF_READ=1  \
-/D HAVE_GD_GIF_CREATE=1  \
-/D HAVE_GDIMAGECOLORRESOLVE=1  \
-/D HAVE_GD_IMAGESETBRUSH=1  \
-/D HAVE_GD_IMAGESETTILE=1 \
-/D HAVE_GD_FONTCACHESHUTDOWN=1 \
-/D HAVE_GD_FONTMUTEX=1 \
 /D HAVE_LIBFREETYPE=1 \
 /D HAVE_GD_JPG  \
 /D HAVE_GD_PNG  \
-/D HAVE_GD_STRINGFTEX=1  \
-/D HAVE_GD_STRINGTTF=1  \
-/D HAVE_GD_WBMP  \
-/D HAVE_GD_XBM  \
 /D HAVE_GD_XPM  \
 /D HAVE_GD_FREETYPE=1  \
 /D HAVE_GD_BMP \
 /D HAVE_GD_TGA \
-/D HAVE_LIBGD13=1  \
-/D HAVE_LIBGD15=1  \
-/D HAVE_LIBGD20=1  \
-/D HAVE_LIBGD204=1 \
 /D HAVE_LIBJPEG  \
 /D HAVE_LIBPNG  \
 /D HAVE_XPM  \
-/D HAVE_COLORCLOSESTHWB  \
 /D HAVE_GD_GET_INTERPOLATION \
-/D USE_GD_IOCTX \
 /D MSWIN32 \
 		");
 		if (ICC_TOOLSET) {