glib-2.0: add missing symbols from 2.38
glib-2.0: add missing symbols from 2.38

rvu95/vala,frida/vala,flobrosch/vala-fixes,frida/vala,frida/vala,GNOME/vala,spidermonkdust/vala,frida/vala,rvu95/vala,flobrosch/vala-fixes,spidermonkdust/vala,rvu95/vala,frida/vala,GNOME/vala,flobrosch/vala-fixes,spidermonkdust/vala,GNOME/vala,GNOME/vala