Implement umask and rlimit in lfp_spawn #30
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Triggered by jruby/jruby#6552 this implements setumask and setrlimit for lfp_spawn
I did refactor the internal file actions struct to be a tagged union, but if you'd prefer to stay linear I can undo that.
I also considered the more ffi-friendly signature
(lfp_spawn_file_actions_t *file_actions, int resource, rlim_t cur, rlim_t max)
but as much as I like that as an end-user, I ended up going with the more standardstruct rlimit*
signature hereFixes #28
Fixes #27