waf miscompiles py2cairo on Lion, linking the wrong Python Library when
HB Python is installed. So add a LINKFLAG that sets the path to the real
python Library as determined by `python-prefix`, where it gets used at
link time and fixes the problem where you can't import cairo into Python.
Also add a `fails_with :llvm` block to work around a build error where
waf tries to optimize with `-march=native` which llvm doesn't accept.
https://bugs.freedesktop.org/show_bug.cgi?id=51544
Tested on Lion and SL using system Python, HB framework Python,
HB non-framework Python with clang building both native and
universal binaries, by importing the cairo module into Python.
Rebased on Homebrew 0.9.2
FixesHomebrew/homebrew#12893ClosesHomebrew/homebrew#12943.
Signed-off-by: Jack Nagel <jacknagel@gmail.com>
