clang-2.9, clang-3.0, clang-3.1, clang-3.2: use python27

[ryandesign (Ryan Carsten Schmidt)]

I have python27 installed; I don't want to have to install python26 as well:

$ port deps clang-{2.9,3.0,3.1,3.2}
Full Name: clang-2.9 @2.9_10+analyzer
Library Dependencies: llvm-2.9, libffi
Runtime Dependencies: clang_select, ld64, python26, perl5
--
Full Name: clang-3.0 @3.0_9+analyzer
Library Dependencies: llvm-3.0, libffi
Runtime Dependencies: clang_select, ld64, python26, perl5
--
Full Name: clang-3.1 @3.1_2+analyzer
Library Dependencies: llvm-3.1, libffi
Runtime Dependencies: clang_select, ld64, python26, perl5
--
Full Name: clang-3.2 @3.2-r160101_0+analyzer+assertions
Fetch Dependencies:   subversion
Library Dependencies: llvm-3.2, libffi
Runtime Dependencies: clang_select, ld64, python26, perl5

[jeremyhu (Jeremy Huddleston Sequoia)]

r95852