grep

• egrep and fgrep are obsolescent; warnings can make some test suites fail so remove them?
• --without-included-regex has been deprecated: https://lists.gnu.org/archive/html/bug-grep/2021-08/msg00028.html
• dirfd patch is for ancient systems: https://lists.gnu.org/archive/html/bug-gnulib/2023-05/msg00040.html