Update libarchive's and liblzma's configuration for recently added stuff.

Update libarchive's and liblzma's configuration for recently added stuff.

Make both use futimens() and utimensat(). xz's configure won't check for
futimes() if futimens() is available (hence HAVE_FUTIMES goes back to
undefined).

While here, define HAVE_DIRFD for libarchive too since we have it as a
public function since de45303d1431339260c3a353a1e18d034c807c4a.

Note that diff and grep also have HAVE_... macros for futimens() and
utimesat() in their config.h's but they are unused in the code, probably
stray configure checks.