BUG/MEDIUM: init: restore behavior of command-line "-m" for memory limitation

The removal for the shared inter-process cache in commit 6fd0450b4
("CLEANUP: shctx: remove the different inter-process locking techniques")
accidentally removed the enforcement of rlimit_memmax_all which
corresponds to what is passed to the command-line "-m" argument.
Let's restore it.

Thanks to @nafets227 for spotting this. This fixes github issue #1319.
1 file changed