configure (incorrectly) detected that mkdir on 5 was broken, however
the workaround it would try to use was even more broken.
Approved by: clement (mentor, implicit)
- implemented [[.a.]] and [[=a=]] where the collating symbol can only
include a single character, and that will be the only matched character
independent of the locale.
- output the result of commands a, r, R when a q command is found.