8039368: Remove testcase from npt utf.c

Summary: don't compile testcase by default
Reviewed-by: sla, vkempik

src/share/npt/utf.c

@@ -396,7 +396,7 @@ utf8mToUtf8s(struct UtfInst *ui, jbyte *string, int length, jbyte *newString, in
 
 /* ================================================================= */
 
-#if 1  /* Test program */
+#ifdef COMPILE_WITH_UTF_TEST  /* Test program */
 
 /*
  * Convert any byte array into a printable string.