python: Resolve intermediate staging issues

Its bad practise to poke into the sysroot without knowledge of sstate.

This adds a patch to python allowing us to account for cross compiling
and allow it to find the Makefile/pyconfig.h files without needing them
in the sysroot for do_compile/do_install to complete.

Tested on two architectures and compared with buildhistory with no
significant delta.

(From OE-Core rev: 16da4f75a75dc8020803df9ea73a2a7ead88cc5a)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python-native_2.7.3.bb

@@ -15,6 +15,7 @@ SRC_URI += "file://04-default-is-optimized.patch \
            file://nohostlibs.patch \
            file://multilib.patch \
            file://add-md5module-support.patch \
+           file://builddir.patch \
            "
 S = "${WORKDIR}/Python-${PV}"