Add compatibility header to 'fast_client'

'fast_client' uses 'clock_gettime' which is provided by the compatibility
layer on Darwin.

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
Include 'libgen.h' in 'fast_client'

'basename' is not declared on Darwin unless 'libgen.h' is included.

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
Include 'libgen.h' in 'fast_server'

Signed-off-by: Jussi Virtanen <jussi.k.virtanen@gmail.com>
Merge pull request #14 from jvirtanen/fixes/darwin

Regain Darwin support (once again)