glamor: Deal with glamor_glyphs_init being removed from xserver

Port of radeon commit 818c180c8932233b214a35ba0647af82f7bcec3d.

configure.ac

@@ -127,6 +127,12 @@ if test "x$GLAMOR" != "xno"; then
 			      [GLAMOR_XSERVER="yes"], [GLAMOR_XSERVER="no"],
 			      [#include "xorg-server.h"
 			       #include "glamor.h"])
+
+		AC_CHECK_DECL(glamor_glyphs_init,
+			      [AC_DEFINE(HAVE_GLAMOR_GLYPHS_INIT, 1,
+					 [Have glamor_glyphs_init API])], [],
+			      [#include "xorg-server.h"
+			       #include "glamor.h"])
 	fi
 
 	if test "x$GLAMOR_XSERVER" != xyes; then

src/amdgpu_glamor.c

@@ -60,8 +60,10 @@ Bool amdgpu_glamor_create_screen_resources(ScreenPtr screen)
 	if (!info->use_glamor)
 		return TRUE;
 
+#ifdef HAVE_GLAMOR_GLYPHS_INIT
 	if (!glamor_glyphs_init(screen))
 		return FALSE;
+#endif
 
 	bo_handle = gbm_bo_get_handle(info->front_buffer->bo.gbm);
 	if (!glamor_egl_create_textured_screen_ext(screen,