only export the GL entry-points, hide everything else.

Conflicts:

	opengl/libagl/Android.mk
	opengl/libs/Android.mk
	opengl/libs/egl_impl.h
diff --git a/opengl/include/KHR/khrplatform.h b/opengl/include/KHR/khrplatform.h
index 4cc27c5..1660bd7 100644
--- a/opengl/include/KHR/khrplatform.h
+++ b/opengl/include/KHR/khrplatform.h
@@ -91,6 +91,8 @@
 #   define KHRONOS_APICALL __declspec(dllimport)
 #elif defined (__SYMBIAN32__)
 #   define KHRONOS_APICALL IMPORT_C
+#elif defined(ANDROID)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
 #else
 #   define KHRONOS_APICALL
 #endif