chisel: Use opt_libexec instead of libexec in caveats

Closes #30890.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
LibreSSL 2.0.2

Update to latest portable release.

Closes #30892.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
libressl: update 2.0.2 bottle.
Rename fetch_bottle_for to fetch_checksum_for
go: Add latest available cross-compilers

Recent releases of Go have added support for additional platforms, so the
--cross-compile-all command of this formula has gotten out of data relative to
"all" available cross-compilers. This update adds on the ARM architecture to
some existing platforms, plus the Solaris, Plan9, and Dragonfly BSD platforms
that are supported in Go 1.3.
go: update 1.3 bottle.