libgltf: turn off openMP usage without any detection code.

Change-Id: Ic823109b812a3d99d8462cf67cd9aa87094bba06

external/libgltf/UnpackedTarball_libgltf.mk

@@ -18,6 +18,7 @@ $(eval $(call gb_UnpackedTarball_set_patchlevel,libgltf,1))
 $(eval $(call gb_UnpackedTarball_add_patches,libgltf,\
 	external/libgltf/patches/include_path_glew.patch \
 	external/libgltf/patches/include_path_freetype.patch \
+	external/libgltf/patches/openmp-disable.patch \
 ))
 
 # vim: set noet sw=4 ts=4:

external/libgltf/patches/openmp-disable.patch

+--- libgltf/src/RenderScene.h
++++ libgltf/src/RenderScene.h
+@@ -16,7 +16,8 @@
+ #include "FPSCounter.h"
+ #include "Timer.h"
+ 
+-#define OPENMPENABLE   1
++// Needs a configure / etc. detection to see if omp.h is on the system ...
++#define OPENMPENABLE   0
+ #if OPENMPENABLE
+ #include <omp.h>
+ #define WAVESIZE 4