libportal: use gir build helper instead of depending on qemu-user

srcpkgs/libportal/template

@@ -3,6 +3,7 @@ pkgname=libportal
 version=0.7.1
 revision=1
 build_style=meson
+build_helper="gir"
 configure_args="$(vopt_bool gtk_doc docs) $(vopt_bool gir vapi)
  -Dbackend-gtk3=enabled -Dbackend-gtk4=enabled -Dbackend-qt5=enabled"
 hostmakedepends="pkg-config glib-devel gobject-introspection $(vopt_if gir vala)
@@ -21,10 +22,6 @@ make_check_pre="xvfb-run"
 build_options="gir gtk_doc"
 build_options_default="gir gtk_doc"
 
-if [ -n "$CROSS_BUILD" ]; then
-	hostmakedepends+=" qemu-user prelink-cross"
-fi
-
 libportal-devel_package() {
 	depends="libportal>=${version}_${revision} glib-devel"
 	short_desc+=" - development files"