* cygwin.din: Add vsyslog.

* fhandler.cc (fhandler_base::write): Only make file sparse if the
	seeked area is >= 128K.
	* syslog.cc (vsyslog): New function, overtaking functionality from
	syslog.
	(syslog): Just call vsyslog.
	* include/cygwin/version.h: Bump API minor.
	* include/sys/syslog.h: Add vsyslog declaration.

winsup/cygwin/include/cygwin/version.h

@@ -206,12 +206,13 @@ details. */
            official release has been made so far.  This change removes
            exported symbols like fopen64, which might confuse configure.
        86: Export ftok
+       87: Export vsyslog
      */
 
      /* Note that we forgot to bump the api for ualarm, strtoll, strtoull */
 
 #define CYGWIN_VERSION_API_MAJOR 0
-#define CYGWIN_VERSION_API_MINOR 86
+#define CYGWIN_VERSION_API_MINOR 87
 
      /* There is also a compatibity version number associated with the
 	shared memory regions.  It is incremented when incompatible

winsup/cygwin/include/sys/syslog.h

@@ -12,6 +12,8 @@ details. */
 #define	_SYS_LOG_H
 
 #include <sys/cdefs.h>
+#include <stdarg.h>
+
 #define	LOG_EMERG	0
 #define	LOG_ALERT	1
 #define	LOG_CRIT	2
@@ -76,6 +78,7 @@ void	closelog (void);
 void	openlog (const char *, int, int);
 int	setlogmask (int);
 void	syslog (int, const char *, ...);
+void	vsyslog (int, const char *, va_list ap);
 
 __END_DECLS