dialog: import dialog 1.3-20210117

Update dialog to 1.2-20130523
Level up WARNS

Revert r241818 that updated dialog to 20120706. This turns out to horribly
break mixed form dialogs in conjunction with the FreeBSD termcap, making
the bsdinstall partition editor Add dialog, among o

Revert r241818 that updated dialog to 20120706. This turns out to horribly
break mixed form dialogs in conjunction with the FreeBSD termcap, making
the bsdinstall partition editor Add dialog, among other things, completely
nonfunctional. This restores dialog 20110707.

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Update dialog to 20120706: includes minor useability enhancements and
fixes for warnings encountered with clang.

Update dialog to version 1.1-20110302.