stlport: Fix incompatibility with clang++ (used by llvm) in ISO C++11 mode

clang++ has a strange idea about wchar_t

Change-Id: I9f73e88cc06c35e988b33576ea235046ea51d546
Signed-off-by: Bernhard Rosenkraenzer <Bernhard.Rosenkranzer@linaro.org>
diff --git a/stlport/stl/_limits.h b/stlport/stl/_limits.h
index c0091f6..349211a 100644
--- a/stlport/stl/_limits.h
+++ b/stlport/stl/_limits.h
@@ -210,7 +210,7 @@
   : public _STLP_PRIV _Integer_limits<unsigned char, 0, UCHAR_MAX, -1, true>
 {};
 
-#if !(defined (_STLP_NO_WCHAR_T) || defined (_STLP_WCHAR_T_IS_USHORT))
+#if !(defined (_STLP_NO_WCHAR_T) || defined (_STLP_WCHAR_T_IS_USHORT)) && !defined(__clang__)
 
 _STLP_TEMPLATE_NULL
 class numeric_limits<wchar_t>