test-lint: only use only sed [-n] [-e command] [-f command_file]

From `man sed` (on a Mac OS X box): The -E, -a and -i options are non-standard FreeBSD extensions and may not be available on other operating systems. From `man sed` on a Linux box: REGULAR EXPRESSIONS POSIX.2 BREs should be supported, but they aren't completely because of performance problems. The \n sequence in a regular expression matches the newline character, and similarly for \a, \t, and other sequences. The -E option switches to using extended regular expressions instead; the -E option has been supported for years by GNU sed, and is now included in POSIX. Well, there are still a lot of systems out there, which don't support it. Beside that, IEEE Std 1003.1TM-2017, see http://pubs.opengroup.org/onlinepubs/9699919799/ does not mention -E either. To be on the safe side, don't allow -E (or -r, which is GNU). Change check-non-portable-shell.pl to only accept the portable options: sed [-n] [-e command] [-f command_file] Reported-by: SZEDER Gábor <szeder.dev@gmail.com> Helped-by: Eric Sunshine <sunshine@sunshineco.com> Helped-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>