[Bug 231765] graphics/wayland: fix build with mips, mips64, powerpc64

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231765

            Bug ID: 231765
           Summary: graphics/wayland: fix build with mips, mips64,
                    powerpc64
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: [email protected]
          Reporter: [email protected]
             Flags: maintainer-feedback?([email protected])
          Assignee: [email protected]

Created attachment 197552
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=197552&action=edit
patch

prctl() function currently doesn't exist in FreeBSD. When compiling with clang
on amd64, only a warning is emitted when this function is used:
tests/test-runner.c:349:8: warning: implicit declaration of function 'prctl' is
invalid in C99 [-Wimplicit-function-declaration]
                rc = prctl(PR_SET_PTRACER, pid);
                     ^
tests/test-runner.c:349:8: warning: this function declaration is not a
prototype [-Wstrict-prototypes]

But when compiling with base GCC (as is on e.g. powerpc64), I'm getting error:
./.libs/libtest-runner.a(test-runner.o): In function `is_debugger_attached':
/tmp/usr/local/poudriere/ports/default/graphics/wayland/work/wayland-1.14.0/tests/test-runner.c:349:
undefined reference to `prctl'

Since it doesn't work even on amd64 properly (even though it compiles), let's
remove this reference.

Tested on amd64 and powerpc64.

Hardware sponsored by IntegriCloud.

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