calendar (1) - patch to correct error description

[Stefan Esser]

JFYI: port version 0.7 or the latest sources in CURRENT include a number
of further enhancements (and an important fix to allow the calendar to
be build on 11.x/12.x which do not have _PATH_LOCALBASE in paths.h).

I have added an #undef command (since it was supported by the calendar
program that used cpp and since it occurs in one of calendar files that
have traditionally been included in FreeBSD) and checks for the correct
use of #else and #endif.

Warnings and error messages caused by malformed input files are now
reported with filename and line number.

The man-page and tests have not been updated to reflect this latest
set of changes, I'll hope to be able to update them in the next few
days.

Please let me know if there are any issues with these changes, since I
want to merge them to 11-STABLE and 12-STABLE sometime next week.

Regards, STefan
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