Require newer Vala compiler
Require newer Vala compiler

See also https://bugzilla.gnome.org/show_bug.cgi?id=638797.
Signed-off-by: W. Michael Petullo <a17fed27eaa842282862ff7c1b9c8395a26ac320@flyn.org>

GNOME/libdmapsharing,wangd/libdmapsharing,wangd/libdmapsharing,GNOME/libdmapsharing,GNOME/libdmapsharing