Remove static mut in chgrp tests and fix memleak inside get_groups
#386
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rustc and rust-analyzer issues a warning on the use of
static mutglobals hence the change to aRwLock.The memory leak was from
libc::mallocnot being accompanied by a correspondinglibc::free. There are multiple exit points (from thepanics) so it's simpler to just RAII it with aVec.