Fix following problem:

Pure-ftpd supports the "SITE UTIME" command, which allows the client to set the
modification time of a file to a particular timestamp, expressed in UTC.

However, pure-ftpd passes the UTC timestamp directly to the operating system's
utime() function, which is a bug, because utime() requires that the timestamp be
in local time instead of UTC.

For example for server with MSK localtime:

---> MDTM cuba2008_1.mpeg.stat
<--- 213 20090106074437

---> SITE UTIME cuba2008_1.mpeg.stat 20090106104437 20090106104437 20090106104437 UTC
<--- 250 UTIME OK

PR: ports/131645
Submitted by: Yar Odin <yarodin@gmai.com>