mutter: fix typelibdir variable

Previously we were using pc_sysrootdir which is an issue since this is used for
the rpath.

srcpkgs/mutter/template

@@ -1,7 +1,7 @@
 # Template file for 'mutter'
 pkgname=mutter
 version=42.3
-revision=1
+revision=2
 build_helper="gir"
 build_style=meson
 configure_args="-Degl_device=true -Dudev=true -Dnative_backend=true
@@ -35,7 +35,6 @@ post_install() {
 	# modify the pkg-config files to respect ${pc_sysrootdir} for variables that are
 	# meant to be called with 'pkg-config --variable'
 	vsed -e 's|^girdir.*|girdir=${pc_sysrootdir}/${libdir}/mutter-10|g' \
-		 -e 's|^typelibdir.*|typelibdir=${pc_sysrootdir}/${libdir}/mutter-10|g' \
 		 -i ${DESTDIR}/usr/lib/pkgconfig/libmutter-10.pc
 }