libglapi: depend on libglvnd for now.

This is a temporary fix until a proper fix exists for xbps.

srcpkgs/mesa/template

@@ -1,7 +1,7 @@
 # Template file for 'mesa'
 pkgname=mesa
 version=19.2.7
-revision=1
+revision=2
 wrksrc="mesa-${version}"
 build_style=meson
 configure_args="-Dglvnd=true -Dshared-glapi=true -Dgbm=true -Degl=true
@@ -130,6 +130,7 @@ post_install() {
 }
 
 libglapi_package() {
+	depends="libglvnd"
 	short_desc="Free implementation of the GL API - shared library"
 	pkg_install() {
 		vmove "usr/lib/libglapi.so.*"