[Bug 235676] sysutils/xen-tools411: add SPICE protocol options and support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235676

            Bug ID: 235676
           Summary: sysutils/xen-tools411: add SPICE protocol options and
                    support
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: royger at freebsd.org
          Reporter: olevole at olevole.ru
          Assignee: royger at freebsd.org
             Flags: maintainer-feedback?(royger at freebsd.org)

Created attachment 201940
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=201940&action=edit
sysutils/xen-tools411: enable SPICE protocol

Tested successful with:

uname -a && clang -v
FreeBSD xen1.my.domain 13.0-CURRENT FreeBSD 13.0-CURRENT r343942 GENERIC  amd64
FreeBSD clang version 7.0.1 (tags/RELEASE_701/final 349250) (based on LLVM
7.0.1)

there are some issues with older CLANG versions in the form of:

/usr/bin/ld: error: undefined symbol: __atomic_fetch_or_4
>>> referenced by qxl.c:1883 (/usr/ports/sysutils/xen-tools411/work/xen-4.11.0/tools/qemu-xen/hw/display/qxl.c:1883)
>>>               ../hw/display/qxl.o:(qxl_send_events)
c++: error: linker command failed with exit code 1 (use -v to see invocation)

where qxl.c:1883 is

>>    old_pending = atomic_fetch_or(&d->ram->int_pending, le_events); <<

https://bugzilla.redhat.com/show_bug.cgi?id=1565766
https://bugs.llvm.org/show_bug.cgi?id=34347

Unfortunately I have no idea how to arrange this in the port Makefile.
I don’t know how to check CLANG version from port file. Another way is enable
this feature for FreeBSD 13+ only, e.g:

.if ${OSVERSION} < 1200074
OPTIONS_DEFINE+= SPICE
..
.endif

but I have no luck with this

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