ndk: Include limits.h in wchar.h as it contains the definitions for INT_MAX and
INT_MIN. Without this fix, the following lines will fail when configuring
gnu stdlibc++ library. (INT_MAX and INT_MIN are undefined.)

    #define  WCHAR_MAX   INT_MAX
    #define  WCHAR_MIN   INT_MIN

Change-Id: Ifa87cf011cf7068c48755fc9ce5c0d73e95ef2dc
Signed-off-by: Chao-Ying Fu <fu@mips.com>
diff --git a/ndk/platforms/android-9/include/wchar.h b/ndk/platforms/android-9/include/wchar.h
index 9b744a5..86d6d73 100644
--- a/ndk/platforms/android-9/include/wchar.h
+++ b/ndk/platforms/android-9/include/wchar.h
@@ -28,6 +28,7 @@
 #ifndef _WCHAR_H_
 #define _WCHAR_H_
 
+#include <limits.h>
 #include <sys/cdefs.h>
 #include <stdio.h>