Merge branch 'comptime-no-fail' into 'master'

Minor comptime refactoring.

See merge request STJr/SRB2!1776

(cherry picked from commit dc02339c)

9bfc82a1 Prevent comptime.* from failing compilation
a614865d Make comptime.sh conform to POSIX and less redundant, among other improvements
b7711b2b Pass argument list directly to functions that use them; quote arguments when used.