fixed https://savannah.gnu.org/bugs/?41934
C-a C-h is a hotkey for 'prev', but C-a h is not.
prepare for v.4.2.0
Apply screen-4.0.2-hankanacopy-patch.
Apply screen-4.0.2-deadlock-patch.
Treat MINUS SIGN (U+2212) as double width.
Merge a patch by Apple.
Merge run_login().
Fix pty ranges for FreeBSD.

Taken from FreeBSD ports.
Fix utmpx related names.

Taken from FreeBSD ports.
Increase the buffer size for a terminal type name.

Taken from FreeBSD ports.
Disable host name chopping because it breaks an IPv6 address.