configure: added xcb to dri3 modules to pkg-conf
configure: added xcb to dri3 modules to pkg-conf

This fixes a recent linking error in libvulkan_common

Reviewed-by: Emil Velikov <f20878473f414da183da19ee25c8722cc1d711e4@collabora.com>
Signed-off-by: Andres Gomez <1948e91ee7852f22bc880d172a32ffca98fb60fa@igalia.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler