fix: Use spinlocks for inode cache memory synchronization (#1229)

fix: Use spinlocks for inode cache memory synchronization (#1229)

Changed the inode cache implementation to use spinlocks instead of pthread
mutexes. This makes the inode cache work on FreeBSD and other systems where the
pthread mutexes are destroyed when the last memory mapping containing the
mutexes is unmapped.

Also added tmpfs, ufs and zfs to the list of supported filesystems on macOS and
BSDs.

See also ccache discussion #1228.