Require python 2.7.
We were already requiring 2.5, which meant that people on old linux distros
had to upgrade anyway.
Requiring python 2.6 will make supporting 3.X easier as we can use the 3.X
exception syntax.
According to the discussion on llvmdev, there is not much value is requiring
just 2.6, we may as well just require 2.7.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224129
91177308-0d34-0410-b5e6-
96231b3b80d8
(cherry picked from commit
708bc15ff07dc2fcee3a66988bfc5bc15b80eb5f)
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