Fixes Homebrew/homebrew#24157.

Fixes Homebrew/homebrew#24654.

Closes Homebrew/homebrew#24695.

The really expensive computation is now cached at its source, and this
only caches true anyway.

This seems to help the problem with `brew install -v` sometimes truncating output.

Closes Homebrew/homebrew#24666.

make sure it doesn't actually point to something else

since sitecustomize.py is put in a location found by pypy,
it breaks pypy by setting sys.executable to a path that is definitely wrong,
and may not even exist.

Closes Homebrew/homebrew#24581.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>

boost149 does not build with 10.9, so remove it from core along with two
formulae that do not build with the latest version of Boost.

Closes Homebrew/homebrew#23696.

This continues to use mavericks_dev_tools? instead of trying to read
from pkgutil because pkgutil is really slow.

Fixes Homebrew/homebrew#24123.

These inhibit warnings-as-errors, so allow them to pass through.

libxslt was misspelled, but more to the point we have libxml2 and
libxslt formulae in core these days so blacklisting them doesn't really
make much sense.

The mapping of architectures to optimization flags is now retrieved from
Hardware::CPU and the selected flags are passed as an environmen
variable, rather than duplicated in the cc wrapper and re-calculated on
every invocation of the compiler.

Closes Homebrew/homebrew#24540.

Closes Homebrew/homebrew#24463.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

Closes Homebrew/homebrew#22030.

Closes Homebrew/homebrew#23972.

Fixes Homebrew/homebrew#24444.
Closes Homebrew/homebrew#24445.
Closes Homebrew/homebrew#24458.

Fixes Homebrew/homebrew#24456.

Closes Homebrew/homebrew#24370.

Closes Homebrew/homebrew#22945.

Closes Homebrew/homebrew#24420.