Windows: rk_wcsdup allocator

patchset 3fe5572840 should have
replaced wcsdup().

Change-Id: Ib1e09477b430525267c6c930d7c4ab29858a68bb

lib/roken/win32_alloc.c

@@ -34,6 +34,7 @@
 #undef malloc
 #undef free
 #undef strdup
+#undef wcsdup
 
 /*
  * Windows executables and dlls suffer when memory is
@@ -67,3 +68,9 @@ rk_strdup(const char *str)
 {
     return strdup( str);
 }
+
+ROKEN_LIB_FUNCTION unsigned short * ROKEN_LIB_CALL
+rk_wcsdup(const unsigned short *str)
+{
+    return wcsdup( str);
+}