[Bug 230478] devel/avro-c: unbreak on aarch64, arm, probably mips too

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230478

            Bug ID: 230478
           Summary: devel/avro-c: unbreak on aarch64, arm, probably mips
                    too
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sunpoet at FreeBSD.org
          Reporter: greg at unrelenting.technology
             Flags: maintainer-feedback?(sunpoet at FreeBSD.org)
          Assignee: sunpoet at FreeBSD.org

Created attachment 196025
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=196025&action=edit
avro-c.patch

avro-c uses GCC atomic intrinsics (__sync_add_and_fetch, __sync_sub_and_fetch).

These are well supported by clang, but the ifdef was testing for GNUC newer
than 40500 and these weren't used.

avro-c had a raw x86 assembly fallback, which is why it worked fine on there.

With this tiny patch, it builds fine on aarch64 and armv7. clang should support
these on mips too I think.

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