[pacman-dev] QNX patches, v2

[Will Miles]

This patch set is a cleaned up version of the the first attempt to add QNX
support.  Changes from the first version include:

* Using Markus Kuhn's implementation of wcwidth and wcswidth
* Breaking the mkdtemp replacement into its own patch, with a proper configure
   test instead of #ifdef __QNX__
* Cleaning up code style everywhere.  Sorry!

Thanks again for taking the time to review my first attempt.