intel/dev: create a helper dependency for libintel_dev

intel/dev: create a helper dependency for libintel_dev

This ensures that users of libintel_dev.a won't be compiled until
include files are generated, and that they are recompiled when the
header changes.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Mark Janes <markjanes@swizzler.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20825>