cmake 2.8.12.1

Closes #24182.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
cmake: 2.8.12.1 bottles.
exceptions: improve tap error message.

Point users to the tap's issue tracker URL.
Only pass cflags during configure and make

Fixes #24172.
Extract archflags method from cflags method
Extract optflags method from cflags method
Remove outdated comment
Add ENV.O0 to stdenv
Simplify ENV.0x methods in stdenv
Allow changing the optimization level under superenv
clisp: enable superenv
pdnsrec: enable superenv