[Bug 240427] Calendar(1): parses SatSecond wrong for September 2019

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240427

            Bug ID: 240427
           Summary: Calendar(1): parses SatSecond wrong for September 2019
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: carlj at peak.org

An entry for SatSecond in September 2019 is actually matched for the first
Saturday.  This might be related to bug #234663, but my testing seems to show
that this only occurs on months in which the first day is Sunday.  The months
of April and July of 2018 also start with Sunday and seem to show the same
problem, as well as September of 2024.

$ grep Shrew calendar
September SatSecond     Shrewsbury Fair (2 days)
$ # note: there is a tab after SatSecond
$ cal Sept 2019
   September 2019     
Su Mo Tu We Th Fr Sa  
 1  2  3  4  5  6  7  
 8  9 10 11 12 13 14  
15 16 17 18 19 20 21  
22 23 24 25 26 27 28  
29 30
$ calendar -A15 -t 01.09.2019
Sep  7* Shrewsbury Fair (2 days)
$ calendar -A15 -t 01.09.2024
Sep  7* Shrewsbury Fair (2 days)
$ calendar -A15 -t 01.09.2018
Sep  8* Shrewsbury Fair (2 days)    <- This one is correct

This was found on an amd64 system with 12.0-RELEASE-p10, but also confirmed
on a RPI2 system running armv7, also with 12.0-RELEASE-p10.

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