util.c: fix order of inclusion to correctly consume config.h

util.c: fix order of inclusion to correctly consume config.h

replace.h has to be the first file included in order to correctly act
upon the definitions in config.h.

Specifically, this change fixes 32-bit i686 builds, which depend upon
_FILE_OFFSET_BITS=64 to be set before any standard library file is
included.

Signed-off-by: Uri Simchoni <urisimchoni@gmail.com>
Reviewed-by: "Stefan (metze) Metzmacher" <metze@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Thu Jul  9 12:32:03 CEST 2015 on sn-devel-104