Windows: rk_wcsdup allocator

patchset 3fe5572840 should have
replaced wcsdup().

Change-Id: Ib1e09477b430525267c6c930d7c4ab29858a68bb

lib/roken/roken.h.in

@@ -359,6 +359,7 @@ rk_vsnprintf (char *str, size_t sz, const char *format, va_list args);
 #define malloc  rk_malloc
 #define realloc rk_realloc
 #define strdup  rk_strdup
+#define wcsdup  rk_wcsdup
 #endif
 
 ROKEN_LIB_FUNCTION void * ROKEN_LIB_CALL
@@ -376,6 +377,9 @@ rk_realloc(void *, size_t);
 ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
 rk_strdup(const char *);
 
+ROKEN_LIB_FUNCTION unsigned short * ROKEN_LIB_CALL
+rk_wcsdup(const unsigned short *);
+
 #endif  /* _MSC_VER */
 
 #ifdef HAVE_WINSOCK

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);
+}