C++: Fix compilation of plain-cplusplus test on OSX.

Change-Id: I5a84a2f3d8157289eba60977a3c9d112e72e679a
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>

src/libs/3rdparty/cplusplus/Literals.cpp

@@ -83,7 +83,7 @@ unsigned Literal::hashCode(const char *chars, unsigned size)
     "a", "aa", "aaa", "aaaa", ...
     */
 
-    uint h = 0;
+    unsigned h = 0;
 
     while (size--) {
         h = (h << 4) + *chars++;