Recursive mutex todo item

[John (J5) Palmieri]

I'm a bit worried about this one.  I set off to implement it and quickly
found out that Linux does this in a slightly different way than other
posix systems.  Namely their recursive mutex attribute is marked as _NP
or non portable.  I'm not sure exactly why this is, but the bigger issue
is crafting the autoconf rules so we don't break other systems we run
on.  Given that we don't have an active *BSD community but it is still
important for 1.0 to give a good faith effort working with those
platforms I would like to push this change out to a point release so as
to not break them.

-- 
John (J5) Palmieri <johnp at redhat.com>