Problem: filetype: fvwm2m4 files are no longer recognized
(after 9.1.1687).
Solution: Add a special case in m4 filetype detection (zeertzjq).
closes: #18146
Co-authored-by: Damien Lejay <damien@lejay.be>
Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>