[Bug 233250] Porter's handbook: Undocumented OPT_USE variable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233250

            Bug ID: 233250
           Summary: Porter's handbook: Undocumented OPT_USE variable
           Product: Documentation
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Documentation
          Assignee: doc at FreeBSD.org
          Reporter: phascolarctos at protonmail.ch

It seems the OPT_USE variable (where OPT stands for any option name) seems to
be undocumented. In particular, it is not listed in "5.13.3.11. Generic
Variables Replacement, OPT_VARIABLE and OPT_VARIABLE_OFF" (see
https://www.freebsd.org/doc/en/books/porters-handbook/makefile-options.html ),
although OPT_USES is different.

For an example of use, here is the bug report where I discovered it's
existence: bug #233240.

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