Second v1.0 Release Candidate Available

This is the second and hopefully the final release candidate from the releases/v1.0 branch. This revision contains the following updates:

1. Pre-compiled headers are now correctly built and used for static libraries.
2. __gthread_* functions now return -1 upon errors, instead of returning a POSIX error number.
3. A typo in __gthread_equal has been fixed.
4. _MCF_sleep() is now responsive to Ctrl-C in consoles.

Full Changelog: v1.0-rc...v1.0-rc.2