[Bug 243320] www/firefox: 72.0.1_1,1 crash on start

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243320

            Bug ID: 243320
           Summary: www/firefox: 72.0.1_1,1 crash on start
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gecko at FreeBSD.org
          Reporter: rozhuk.im at gmail.com
          Assignee: gecko at FreeBSD.org
             Flags: maintainer-feedback?(gecko at FreeBSD.org)

[14897, Main Thread] WARNING: failed to freeze shm: Function not implemented:
file
/tmp/ports/usr/ports/www/firefox/work/firefox-72.0.1/ipc/chromium/src/base/shared_memory_posix.cc,
line 289
Segmentation fault (core dumped)

=============================================================================
#elif defined(__FreeBSD__)
  cap_rights_t rights;
  cap_rights_init(&rights, CAP_MMAP_R);
  if (cap_rights_limit(mapped_file_, &rights) != 0) {
    CHROMIUM_LOG(WARNING) << "failed to freeze shm: " << strerror(errno);
    //return false; // - My temp FIX - works.
  }
=============================================================================

Better to check ENOSYS != errno:
if (cap_rights_limit(mapped_file_, &rights) != 0 && ENOSYS != errno) {
and only in this case fail.

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