python-2.6.6: py_package_preprocess should change Makefile only in PKGD not D

* PACKAGEFUNCS ?= "perform_packagecopy \
                ${PACKAGE_PREPROCESS_FUNCS} \
  our py_package_preprocess is called after perform_packagecopy which does copy D to PKGD
  so we change it to target version in D (image/) before populating sysroot (sysroot-destdir/)
  while keeping Makefile.sysroot version in PKGD which was created before calling
  py_package_preprocess, so both package for runtime and sysroot end wrong

* I haven't seen this problem on faster builder, I guess because do_package and do_populate_sysroot
  can run in paralell and I was lucky that do_populate_sysroot finished before py_package_preprocess
  was started, but if you build python step by step -c package first you should see it every time

* here is proof that with PKGD it works better:
  $ bitbake -c cleanall python
  $ bitbake -c install python
  $ grep LIBDIR= \
    ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile \
    ./package/usr/lib/python2.6/config/Makefile \
    ./sysroot-destdir/usr/lib/python2.6/config/Makefile \
    ./image/usr/lib/python2.6/config/Makefile \
    ./Python-2.6.6/Makefile \
    ~/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile
  grep: ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile: No such file or directory
  grep: ./package/usr/lib/python2.6/config/Makefile: No such file or directory
  grep: ./sysroot-destdir/usr/lib/python2.6/config/Makefile: No such file or directory
  ./image/usr/lib/python2.6/config/Makefile:LIBDIR=               /OE/shr-core/tmp/sysroots/om-gta02/usr/lib
  ./Python-2.6.6/Makefile:LIBDIR=         /usr/lib
  /OE/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile:LIBDIR=            /OE/shr-core/tmp/sysroots/om-gta02/usr/lib

  $ bitbake -c package python
  $ grep LIBDIR= \
    ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile \
    ./package/usr/lib/python2.6/config/Makefile \
    ./sysroot-destdir/usr/lib/python2.6/config/Makefile \
    ./image/usr/lib/python2.6/config/Makefile \
    ./Python-2.6.6/Makefile \
    ~/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile
  ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile:LIBDIR=             /usr/lib
  ./package/usr/lib/python2.6/config/Makefile:LIBDIR=             /usr/lib
  grep: ./sysroot-destdir/usr/lib/python2.6/config/Makefile: No such file or directory
  ./image/usr/lib/python2.6/config/Makefile:LIBDIR=               /OE/shr-core/tmp/sysroots/om-gta02/usr/lib
  ./Python-2.6.6/Makefile:LIBDIR=         /usr/lib
  /OE/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile:LIBDIR=            /OE/shr-core/tmp/sysroots/om-gta02/usr/lib

  $ bitbake -c package python
  $ grep LIBDIR= \
    ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile \
    ./package/usr/lib/python2.6/config/Makefile \
    ./sysroot-destdir/usr/lib/python2.6/config/Makefile \
    ./image/usr/lib/python2.6/config/Makefile \
    ./Python-2.6.6/Makefile \
    ~/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile
  ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile:LIBDIR=             /usr/lib
  ./package/usr/lib/python2.6/config/Makefile:LIBDIR=             /usr/lib
  ./sysroot-destdir/usr/lib/python2.6/config/Makefile:LIBDIR=             /OE/shr-core/tmp/sysroots/om-gta02/usr/lib
  ./image/usr/lib/python2.6/config/Makefile:LIBDIR=               /OE/shr-core/tmp/sysroots/om-gta02/usr/lib
  ./Python-2.6.6/Makefile:LIBDIR=         /usr/lib
  /OE/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile:LIBDIR=            /OE/shr-core/tmp/sysroots/om-gta02/usr/lib

* without this patch we have /usr/lib/ in image/sysroot-destdir and SYSROOT_LIBDIR in package/packages-split
  $ grep LIBDIR= \
    ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile \
    ./package/usr/lib/python2.6/config/Makefile \
    ./sysroot-destdir/usr/lib/python2.6/config/Makefile \
    ./image/usr/lib/python2.6/config/Makefile \
    ./Python-2.6.6/Makefile \
    ~/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile
  ./packages-split/python-distutils/usr/lib/python2.6/config/Makefile:LIBDIR=             /OE/shr-core/tmp/sysroots/om-gta02/usr/lib
  ./package/usr/lib/python2.6/config/Makefile:LIBDIR=             /OE/shr-core/tmp/sysroots/om-gta02/usr/lib
  ./sysroot-destdir/usr/lib/python2.6/config/Makefile:LIBDIR=             /usr/lib
  ./image/usr/lib/python2.6/config/Makefile:LIBDIR=               /usr/lib
  ./Python-2.6.6/Makefile:LIBDIR=         /usr/lib
  /OE/shr-core/tmp/sysroots/om-gta02/usr/lib/python2.6/config/Makefile:LIBDIR=            /usr/lib

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

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