* Added sigmask() macro.
* Fixed libutil.h I broke yesterday: it's thought to add functions only if
you've included some other headers before; added the correct header guard
we're using for our sys/param.h.
* Added pidfile.c to the build.
* Fixed warning in realhostname.c, and pidfile.c.
git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@23840 a95241bf-73f2-0310-859d-f6bbb57e9c96
