build: Do not AC_REQUIRE AM_PROG_VALAC
build: Do not AC_REQUIRE AM_PROG_VALAC

This ran the macro independently whether --enable-vala was supplied or
not.

Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,jku/rygel,GNOME/rygel,jku/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,Tarnyko/rygel,GNOME/rygel