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Fix a number of bugs in freebsd32's capabilities.conf.

Description

Fix a number of bugs in freebsd32's capabilities.conf.

Bugs range from failure to update after changing syscall implementaion
names to using the wrong name. Somewhat confusingly, the name in
capabilities.conf is exactly the string that appears in syscalls.master,
not the name with a COMPAT* prefix which is the actual function name.

Found while making a change to use the default capabilities.conf.

Fixes: r335177, r336980, r340272, r340274, others
Reviewed by: kib, emaste
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D17925