vte: Upgrade to 0.64.0 release

Use git for SRC_URI as thi release has not appeared on gnome downloads yet
Drop LGPL-2.0 as it has fully moved to LGPL-3.1+ see [1] that also
covers for change in License checksums for GPL-3

Add license information to cover for Xterm files in libvte

Add new glade files into -dev package

[1] https://github.com/GNOME/vte/commit/5e14529d4219f3792690566ef7ec70febd87e070



Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>