Merge pull request #3809 from wtgodbe/utf8

Ported managed Utf8/Unicode encoder/decoder to C++ for usage in PAL

Author: janvorli

src/pal/src/locale/unicode.cpp

@@ -928,6 +928,10 @@ WideCharToMultiByte(
     {
         CFRelease(cfString);
     }
+#else /*HAVE_COREFOUNDATION */
+    ERROR( "This code page is not in the system.\n" );
+    SetLastError( ERROR_INVALID_PARAMETER );
+    goto EXIT;
 #endif /* HAVE_COREFOUNDATION */
 
 EXIT: