New debian package.
Fix build process on Debian/FreeBSD and BSD.

 * sys/prctl.h can be found only on Linux, but cmake recognizes Debian/kFreeBSD
 as Linux.
 * extern "C" for TIMEOUT_INFINITY (it is used in plugins)
New Debian snapshot.
Fix debian/rules clean section (cleanup CMake files).
Remove tarantool/config.h pointedly (Debian/BSD).
Drop BSD dependencies in Debian/kFreeBSD.
New Debian upload.
macosx: MacOS X doesn't have sigtimedwait()
Merge branch 'stable'