test/wcc: drop 737's dead runbuild helper (predates T3 -o semantics)

test/wcc/737_direnum.c

@@ -30,15 +30,6 @@ runwait(const char *cmd)
 	return 1;
 }
 
-static int
-runbuild(const char *driver, const char *src, const char *outbin)
-{
-	char cmd[2048];
-	snprintf(cmd, sizeof cmd, "%s build %s -o /dev/null >/dev/null 2>%s",
-	    driver, src, outbin);
-	return runwait(cmd);
-}
-
 static int
 stderr_contains(const char *path, const char *needle)
 {