Line timestamping does not work with add linefeed

[Juho Jokelainen]

When minicom receives only CR and itself adds the LF,
the result does not register as a newline for timestamping lines.
This results in no timestamps at all.

One way to fix this is to change the test for last_ch, as in
minicom-timestamp-test.patch,
another way is to override the last_ch when adding the extra LF as in
minicom-last_ch-change.patch

These changes clash with
https://salsa.debian.org/minicom-team/minicom/-/merge_requests/20 and
https://salsa.debian.org/minicom-team/minicom/-/merge_requests/6
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