Improve logger API (#262)

This breaking change improves naming consistency.

- Rename LOGF to INFOF
- Rename recently introduced ANYF to LOGF
- Remove V* log calls, as they are not being used

libc/log/vflogf.c

@@ -65,9 +65,9 @@ void vflogf_onfail(FILE *f) {
  * will display microseconsd as a delta elapsed time. This is useful if
  * you do something like:
  *
- *     LOGF("connecting to foo");
+ *     INFOF("connecting to foo");
  *     connect(...)
- *     LOGF("connected to foo");
+ *     INFOF("connected to foo");
  *
  * In that case, the second log entry will always display the amount of
  * time that it took to connect. This is great in forking applications.
@@ -101,7 +101,6 @@ void(vflogf)(unsigned level, const char *file, int line, FILE *f,
     vflogf_onfail(f);
   }
   (vfprintf)(f, fmt, va);
-  va_end(va);
   fputs("\n", f);
   if (bufmode == _IOLBF) {
     f->bufmode = _IOLBF;