Fix dependency issue around mesa and egl in weston_6.0.0

Fix dependency issue around mesa and egl in weston_6.0.0

Fix issues like:
ERROR: weston-6.0.0-r0.agl_arago_23 do_prepare_recipe_sysroot: The file /usr/lib/libglapi.so.0 is installed by both mesa-gl and ti-sgx-ddk-um, aborting
ERROR: weston-6.0.0-r0.agl_arago_23 do_prepare_recipe_sysroot: Function failed: extend_recipe_sysro

by applying the solution from recent upstream versions.

Bug-AGL: SPEC-3320
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>
Change-Id: I4b56f13ead056b7a63be70b9116d744916719e82