removed the local copy of xxmodule, and skip only test_build_ext when xxmodule is not found, not the whole unittest

But when the "dl" module is available, it gives a py3k deprecation warning.

reverting partially distutils to its 2.6.x state so 2.7a4 looks more like the 2.7b1 in this. the whole revert will occur after a4 is tagged

with -OO.  Tests requiring docstrings are skipped.  Patch by
Brian Curtin, thanks to Matias Torchinsky for helping review and
improve the patch.

Fixed #7748: now upload and register commands don't need to force the encoding anymore : DistributionMetada returns utf8 strings

for the machine ("i386" or "ppc"), even if the executable is
64-bit.

This patchs ensures that the distutils platform architecture
represents the architecture for the executable when running a
64-bit only executable on OSX.

on OSX. Without this patch it wasn't possible after all
to compile extensions on OSX 10.6 with the binary
installer unless the user had installed the (non-default)
10.4u SDK.

Issue #7457: added a read_pkg_file method to distutils.dist.DistributionMetadata so we can read back PKG-INFO files