[Bug 249297] man: manual pages in non-default sections not found

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=249297

            Bug ID: 249297
           Summary: man: manual pages in non-default sections not found
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: memreflect at pm.me

Created attachment 217939
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=217939&action=edit
Honor MANSECT and -S section-list when matching section names

man(1) relies on the default list of manual sections when determining whether
an argument is a section name, completely ignoring the MANSECT environment
variable and the sections listed in the argument to the -S option.

I encountered this behavior when trying to determine why

    man -S '1:3p' '3p' printf

would open printf(1) instead of printf(3p) after installing man-pages-posix[1],
yet

    man -S '3p' printf

worked correctly.

Attached is a patch that ensures the section list provided by either the -S
option (which sets the MANSECT shell variable) or the MANSECT environment
variable is searched if they don't expand to an empty string, else the default
section list is searched.  It intentionally avoids setting the MANSECT shell
variable since that's taken care of later by the man_setup() function.

[1]: https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/man-pages-posix/

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