Patch from Steve Langasek to add support for wrapping setpriority(). closes: #693580.

 The upstart test suite relies on calling upstart code which assumes
 being able to call setpriority(0); but some Debian buildds run builds
 with a higher nice level under fakeroot.  So it's useful for fakeroot
 to wrap setpriority().
Use colon as a delimiter for preload libs. closes: #697430.
Patch from Andrew Shadura to fix fts_statp-related segfault. closes: #722596.