glsl: remove some deps on mtypes.h.

This should reduce having to rebuild parts of the GLSL compiler
when mtypes.h changes.

Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14437>

src/compiler/glsl/builtin_variables.cpp

@@ -41,10 +41,11 @@
 #include "linker.h"
 #include "glsl_parser_extras.h"
 #include "glsl_symbol_table.h"
-#include "main/mtypes.h"
+#include "main/consts_exts.h"
 #include "main/uniforms.h"
 #include "program/prog_statevars.h"
 #include "program/prog_instruction.h"
+#include "util/compiler.h"
 #include "builtin_functions.h"
 
 using namespace ir_builder;