add xextproto_debian.bb: recipe for xextproto
add xextproto_debian.bb: recipe for xextproto

xextproto now can build from debian source code (x11proto-xext)
with recipes in meta and meta-debian.

Signed-off-by: Tran Thi Van Dung <4602a2150458a8fc79ca562d1ec5fffebd9f9638@toshiba-tsdv.com>

meta-debian/meta-debian,rofehr/meta-debian,tienlee/meta-debian,congnt-tsdv/meta-debian,tienlee/meta-debian,wwright2/meta-debian,tienlee/meta-debian,congnt-tsdv/meta-debian,wwright2/meta-debian,nghiaht-tsdv/meta-debian,rofehr/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,congnt-tsdv/meta-debian,congnt-tsdv/meta-debian,rofehr/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,wwright2/meta-debian,rofehr/meta-debian,wwright2/meta-debian,rofehr/meta-debian,congnt-tsdv/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,wwright2/meta-debian,meta-debian/meta-debian,congnt-tsdv/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,rofehr/meta-debian,meta-debian/meta-debian