Build various unit-test main() programs in utils.

I found these while going through the code, and decided if we're going
to have them then we should compile them. They didn't all compile
first time, proving my point :-)

I've enhanced the tree234 test so that it has a verbose option, which
by default is off.

utils/wildcard.c

@@ -344,7 +344,7 @@ bool wc_unescape(char *output, const char *wildcard)
     return true;                       /* it's clean */
 }
 
-#ifdef TESTMODE
+#ifdef TEST
 
 struct test {
     const char *wildcard;
@@ -483,4 +483,4 @@ int main(void)
     return 0;
 }
 
-#endif
+#endif /* TEST */