nir: move shader_enums.[ch] to compiler

This way one can reuse it in glsl, nir or other infrastructure without
pulling nir as dependency.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Acked-by: Matt Turner <mattst88@gmail.com>
Acked-by: Jose Fonseca <jfonseca@vmware.com>

Android.mk

@@ -86,6 +86,7 @@ ifneq ($(strip $(MESA_GPU_DRIVERS)),)
 SUBDIRS := \
 	src/loader \
 	src/mapi \
+	src/compiler \
 	src/glsl \
 	src/mesa \
 	src/util \