cygserver: Speed up non-debug scenario

_log/_vlog were always called so we always had a function call hit even
if we're not debugging.  Expand on the debugging macros so the decision
to call _log/_vlog is done in the caller already.  Also, make a log level
difference between syscall_printf and system_printf.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>

winsup/cygserver/bsd_log.cc

@@ -93,7 +93,7 @@ _log (const char *file, int line, int level, const char *fmt, ...)
 void
 _vpanic (const char *file, int line, const char *fmt, va_list ap)
 {
-  _vlog (file, line, LOG_CRIT, fmt, ap);
+  _vlog (file, line, LOG_EMERG, fmt, ap);
   exit (1);
 }