contrib/bsddialog: Import version 1.0.3

Change --mixedform output to adapt to bsdinstall restoring dialog(1)
behavior.

Avoid to print the field value to output if <fieldlen> is read-only
(less than or equal to zero). This fixes passwords in wlanconfig,
avoiding to print also SSID.

To note --mixedform continues to print field value if <flag> is
read-only. This avoids breaking netconfig and netconfig_ipv6.

See /usr/src/contrib/bsddialog/CHANGELOG '2024-05-27 Version 1.0.3'
for more detailed information.

Reported by:	garga
-----BEGIN PGP SIGNATURE-----
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=L6wv
-----END PGP SIGNATURE-----