vapi: Add glib-unix.h functions to glib-2.0.vapi
vapi: Add glib-unix.h functions to glib-2.0.vapi

To bind the things in glib-unix.h. Creating a separate glib-unix-2.0.vapi is
unneccessary because these functions are present in libglib-2.0.so itself,
rather than a separate library. They just require the glib-unix.h header to
be included.

Closes: https://bugzilla.gnome.org/show_bug.cgi?id=667894

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