Readline

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* 15: Improved detection of compilers before Xcode 4.3
* Uses Python 3.x readline.c from v3.3.0 tag (changeset 73997)
* Updated to build against readline 6.2 (patch-level 4)

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* 14: Fixed compilation with Xcode 4.3 on Mac OS 10.7
* Updated to build against readline 6.2 (patch-level 2)

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* 10: Fixed '_emacs_meta_keymap' missing symbol on Mac OS 10.7
* 7: Fixed SDK version check to work with Mac OS 10.7 and later
* Uses Python 2.x readline.c from release27-maint branch (r87358)
* Uses Python 3.x readline.c from release32-maint branch (r88446)

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* 5: Removed '-arch ppc' on Mac OS 10.6, as Snow Leopard supports Intel only
* Updated to build against readline 6.2 (patch-level 1)

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* Changed version number to reflect readline version instead of Python version
* 4: Updated to build against readline 6.1 (patch-level 2)
* 2: Python 3 support
* Uses Python 2.x readline.c from release27-maint branch (r83672)
* Uses Python 3.x readline.c from r32a2 tag (r84541)
* Source code moved to GitHub
* Additional maintainer: Sridhar Ratnakumar

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* Added -fPIC to compiler flags to fix linking error on 64-bit Ubuntu
* Enabled all readline functionality specified in pyconfig.h macros
* Uses readline.c from Python svn trunk (r75725), which followed 2.6.4 release
* Patched readline.c to replace Py_XDECREF calls with the safer Py_CLEAR
* Fixed compilation error on Mac OS 10.4 with XCode older than version 2.4