[Bug 258394] archivers/upx: fix build with clang 13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258394

            Bug ID: 258394
           Summary: archivers/upx: fix build with clang 13
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: fjoe@FreeBSD.org
          Reporter: dim@FreeBSD.org
             Flags: maintainer-feedback?(fjoe@FreeBSD.org)
          Assignee: fjoe@FreeBSD.org

During an exp-run for llvm 13 (see bug 258209), it turned out that
archivers/upx fails to build with clang 13 [1]:

p_wcle.cpp:739:27: error: variable 'n' set but not used
[-Werror,-Wunused-but-set-variable]
    unsigned count,object,n,r;
                          ^
1 error generated.

This is because clang 13 now has a -Wunused-but-set-variable warning similar to
gcc's, and it is enabled under -Wall.

The p_wcle.cpp file has two instances where the 'n' variable is used for
debugging purposes, but the first instance is marked with UNUSED(n). The second
is not, triggering this warning.

[1]
http://gohan04.nyi.freebsd.org/data/mainamd64PR258209-default/2021-09-05_20h27m09s/logs/errors/upx-3.95.log

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