tests: add memfd_create test variants with different xlat verbosity levels

tests: add memfd_create test variants with different xlat verbosity levels

* tests/memfd_create-Xabbrev.c: New file.
* tests/memfd_create-Xraw.c: Likewise.
* tests/memfd_create-Xverbose.c: Likewise.
* tests/memfd_create.c: Add handling of XLAT_RAW and XLAT_VERBOSE flags.
* tests/pure_executables.list: Add memfd_create-Xabbrev, memfd_create-Xraw,
and memfd_create-Xverbose.
* tests/.gitignore: Likewise.
* tests/gen_tests.in (memfd_create-Xabbrev, memfd_create-Xraw,
memfd_create-Xverbose): New tests.