Fixed misspellings reported at [Bug #16437], only in ruby and rubyspec.

This removes the related tests, and puts the related specs behind
version guards.  This affects all code in lib, including some
libraries that may want to support older versions of Ruby.

Skip Process clockres specs that don't work on either FreeBSD or
Solaris/AIX in addition to OpenBSD.

Run most current String#crypt specs on non-OpenBSD, and add a new
set of crypt specs for OpenBSD, which support bcrypt but not DES
in crypt(3).

Use @server.connect_address instead of @server.getsockname in some
socket tests, as OpenBSD does not treat connection to all zero
IPv4 or IPv6 addresses as connection to localhost.

When trying to connect using UDP on an unsupported address family,
allow Errno::EPROTONOSUPPORT in addition to Errno::EAFNOSUPPORT,
as OpenBSD raises the former.