autotools: Add passes.h to sources so it will be included in the tarball

This was introduced in commit 8f848ada8a42d9aaa8136afa1bafe32281a0fb48
but not added to the sources list, which is necessary for it to be
included in release tarballs.

Fixes: 8f848ada8a42d9aaa8136afa1bafe32281a0fb48
       ("swr/rast: Start refactoring of builder/packetizer.")
Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
1 file changed