python, python-native: always set platform to linux2

* Fixes many problems with linux2 vs. linux3. At least:
  - Detected version was from build-host instead of target-host.
  - linuxaudiodev and ossaudiodev were disabled for linux3.
  - Files were missing in /usr/lib/python2.7/plat-linux3.
* Imported from upstream HG rev c816479f6aaf
* Bugtracker URL: http://bugs.python.org/issue12326

(From OE-Core rev: accb2b728ab10cae20be59253a56ac6410b8de10)

Signed-off-by: Andreas Oberritter <obi@opendreambox.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python-native_2.7.2.bb

@@ -13,6 +13,7 @@ SRC_URI += "file://04-default-is-optimized.patch \
            file://nohostlibs.patch \
            file://multilib.patch \
            file://add-md5module-support.patch \
+           file://sys_platform_is_now_always_linux2.patch \
            "
 S = "${WORKDIR}/Python-${PV}"