[Bug 258471] emulators/elliott: fix build with clang 13

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 13 Sep 2021 07:59:21 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=258471

            Bug ID: 258471
           Summary: emulators/elliott: 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: ports-bugs@FreeBSD.org
          Reporter: dim@FreeBSD.org

During an exp-run for llvm 13 (see bug 258209), it turned out that
emulators/elliott fails to build with clang 13:

emulator.c:536:20: error: variable 'y' set but not used
[-Werror,-Wunused-but-set-variable]
        int x, x1, y;
                   ^
1 error generated.

This is because x, x1 and y are used in ncurses getyx() macros, but in this
case the program is not interested in the y result. Mark it as __unused to get
rid of the warning.

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