Add minimal supports to build multilib x86 toolchain with OpenMP

Change-Id: I095c15d2a2de11992890c2a03be0f90332d372de
diff --git a/ndk/platforms/android-3/include/stdint.h b/ndk/platforms/android-3/include/stdint.h
index 44613d5..7ae2595 100644
--- a/ndk/platforms/android-3/include/stdint.h
+++ b/ndk/platforms/android-3/include/stdint.h
@@ -191,8 +191,13 @@
  * intptr_t & uintptr_t
  */
 
+#ifdef __LP64__
+typedef long          intptr_t;
+typedef unsigned long uintptr_t;
+#else
 typedef int           intptr_t;
 typedef unsigned int  uintptr_t;
+#endif
 
 #ifdef __STDINT_LIMITS
 #  define INTPTR_MIN    INT32_MIN