Fix compilation problem when --with-logging=file was specified. This

means that syslog is now required to build sudo but that should not
be a problem.  If it is it can be fixed trivially with a configure
check for syslog() or syslog.h.

logging.h

@@ -35,6 +35,7 @@
 #ifndef _LOGGING_H
 #define _LOGGING_H
 
+#include <syslog.h>
 #ifdef __STDC__
 # include <stdarg.h>
 #else
@@ -46,10 +47,6 @@
 #define SLOG_FILE		0x02
 #define SLOG_BOTH		0x03
 
-#if (LOGGING & SLOG_SYSLOG)
-# include <syslog.h>
-#endif
-
 /* Flags for log_error() */
 #define MSG_ONLY		0x01
 #define USE_ERRNO		0x02