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

extensions with msvc9compiler.

ignores the '-isysroot' option on OSX when the
corresponding SDK is not installed.

This ensures that the user can compile extensions
on OSX 10.6 using the Python.org installer and a
default installation of Xcode.

improved distutils test coverage: now the DEBUG mode is covered too (will help fix the issue #6954 in py3k branch)

to --with-universal-archs

and --with-universal-archs=3-way (issue6245)

added more test coverage for distutils.filelist to prevent regressions when fnmatch or re are changed