glib-2.0: add feature test macro _GNU_SOURCE for exp10(3) and exp10f(3)
glib-2.0: add feature test macro _GNU_SOURCE for exp10(3) and exp10f(3)

https://bugzilla.gnome.org/show_bug.cgi?id=614788

GNOME/vala,GNOME/vala,GNOME/vala,GNOME/vala,frida/vala,frida/vala,frida/vala,frida/vala,frida/vala