[PATCH 2 of 2 DROP-PYTHON-2.4] setup.py: drop compatibility with Python 2.4 and 2.5

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at fb.com>
# Date 1431153855 25200
#      Fri May 08 23:44:15 2015 -0700
# Node ID 86d3dce8979a3c2f9b826ed7981d4ffe2f9444f5
# Parent  16b07284fef670b26815b6533b742b21f40fedb1
setup.py: drop compatibility with Python 2.4 and 2.5

The last blocker for dropping Python 2.4 was Centos 5. We now provide our own
Mercurial package for Centos 5 with a bundled Python2.7.

I'm therefore happy to officially drop compatibility with Python 2.4 (and
Python 2.5 that nobody really cares about). This open the season for code
cleanup.

It is war's prize to take all vantage.

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -3,12 +3,12 @@
 #
 # 'python setup.py install', or
 # 'python setup.py --help' for more options
 
 import sys, platform
-if getattr(sys, 'version_info', (0, 0, 0)) < (2, 4, 0, 'final'):
-    raise SystemExit("Mercurial requires Python 2.4 or later.")
+if getattr(sys, 'version_info', (0, 0, 0)) < (2, 6, 0, 'final'):
+    raise SystemExit("Mercurial requires Python 2.6 or later.")
 
 if sys.version_info[0] >= 3:
     def b(s):
         '''A helper function to emulate 2.6+ bytes literals using string
         literals.'''