dpkg-architecture command is not found on $PATH.  This should fix the failures
on FreeBSD and Solaris, which do not create the target file via I/O
redirection if the command isn't found (unlike Linux and OS X which do).

extending search paths to include multiarch directories.

Issue #10762: Guard against invalid/non-supported format string '%f' on Windows. Patch Santoso Wijaya.

ti can raise an exception even if PyLong_Check() has
succeeded.

(This version is a cleaned-up backport of a fix by Senthil Kumaran.)

Patch by Mark Mc Mahon.

Issue #9696: Fix exception incorrectly raised by xdrlib.Packer.pack_int when trying to pack a negative (in-range) integer.

Patch by Christoph Gohlke.
Closes #7639.

Patch by Ben Hayden.

The options listed in the table are now links to their documentation,
and the table uses compact markup to make it easier to read and edit.
First proposed in #10998.

This patch doesn't quite fix the 'run in a VM with Samba share'
timing problem, but it should at least make it better.

Algorithm and initial patch by Michael Henry.