package/frotz: Update to version 2.53
This version should now also compile fine on systems without pthreads,
so we can remove the dependency on BR2_TOOLCHAIN_HAS_THREADS again.
While we're at it, also fix a typo in the description (replace "can not"
with "cannot").
Signed-off-by: Thomas Huth <huth@tuxfamily.org>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>