open https://gitlab.synchro.net/main/sbbs/-/issues/466

Allow abbs to receive an ircd.rehash message that'll touch /sbbs/ctrl/ircd.rehash since the ircd will listen for this running standalone. As discussed on ircd, it may be desirable for the sysop to be able to touch any file.
--- SBBSecho 3.20-Linux
* Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)