[XRay] Fix supposely failing test for FreeBSD
One test was marked as XFAIL for FreeBSD however still running when launching make check-xray
Reviewers: krytarowski, vitalybuka
// RUN: rm log-args-this-* || true
// RUN: XRAY_OPTIONS="patch_premain=true verbosity=1 xray_logfile_base=log-args-this-" %run %t
//
-// XFAIL: freebsd || arm || aarch64 || mips
+// XFAIL: FreeBSD || arm || aarch64 || mips
// UNSUPPORTED: powerpc64le
#include "xray/xray_interface.h"
#include <cassert>
