libdaemon: Use correct type for PID in fork and pid_file_is_running.
libdaemon: Use correct type for PID in fork and pid_file_is_running.

Fixes bug 626540.

spidermonkdust/vala,kamanashisroy/aroop,playya/vala,spidermonkdust/vala,flobrosch/vala-fixes,severinh/vala,jessevdk/vala,jessevdk/vala,frida/vala,severinh/vala,kamanashisroy/aroop,frida/vala,rvu95/vala,frida/vala,flobrosch/vala-fixes,Distrotech/vala,spidermonkdust/vala,Distrotech/vala,flobrosch/vala-fixes,tjol/vala-tjol,GNOME/vala,Distrotech/vala,xdave/pvala,tjol/vala-tjol,frida/vala,GNOME/vala,GNOME/vala,playya/vala,playya/vala,kamanashisroy/aroop,rvu95/vala,severinh/vala,jessevdk/vala,rvu95/vala,frida/vala,GNOME/vala,tjol/vala-tjol