Fix build on FreeBSD: kinfo_getproc is in libutil

I can't find the function for NetBSD and OpenBSD. There's a good chance
QtCore simply fails to compile.

Change-Id: Ib056b47dde3341ef9a52ffff13efaff642bd7bb9
Link: http://www.freebsd.org/cgi/man.cgi?query=kinfo_getproc
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

src/corelib/io/io.pri

@@ -147,6 +147,7 @@ win32 {
             SOURCES += io/qsettings_mac.cpp
             OBJECTIVE_SOURCES += io/qurl_mac.mm
         }
+        freebsd: LIBS_PRIVATE += -lutil         # qlockfile_unix.cpp requires this
         mac {
             osx {
                 OBJECTIVE_SOURCES += io/qfilesystemwatcher_fsevents.mm