glib-2.0: add missing C header for g_fopen
glib-2.0: add missing C header for g_fopen

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