scons: Take indirect gl_and_es_API.xml dependencies in consideration.

Same as 26a8f76ba1a0229ee3332eaa6f1aea89d617cf3d.

Trivial.
diff --git a/src/mesa/SConscript b/src/mesa/SConscript
index 05aa660..13a2e6a 100644
--- a/src/mesa/SConscript
+++ b/src/mesa/SConscript
@@ -53,7 +53,7 @@
 get_hash_header = env.CodeGenerate(
       target = 'main/get_hash.h',
       script = 'main/get_hash_generator.py',
-      source = GLAPI + 'gen/gl_and_es_API.xml',
+      source = [GLAPI + 'gen/gl_and_es_API.xml'] + env.Glob(GLAPI + 'gen/*.xml'),
       command = python_cmd + ' $SCRIPT ' + ' -f $SOURCE > $TARGET'
 )