[Bug 201981] [MAINTAINER] sysutils/b2sum: build fix

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=201981

            Bug ID: 201981
           Summary: [MAINTAINER] sysutils/b2sum: build fix
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: matthew at reztek.cz
 Attachment #159377 maintainer-approval+
             Flags:

Created attachment 159377
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=159377&action=edit
sysutils/b2sum build fix

Build with 9.x's older Clang fails in SSE path (default on amd64) without
-flax-vector-conversions. Ideally the addition of that CFLAG could be
conditional upon CHOSEN_COMPILER_TYPE == "clang" && COMPILER_VERSION < 34, but
those variables cannot be checked without a USES=compiler, which we only have
in the OPENMP case, but in that case we know CHOSEN_COMPILER_TYPE == "gcc". Or,
at least it should... compiler:openmp selects GCC on 10.x but selects Clang on
9.x. So, just add -flax-vector-conversions to CFLAGS for the whole SSE path, it
should be harmless for newer compilers.

While here, update the distfile. Upstream rolled a new one dated a few days
later. The previous distfile had a few binaries in it.

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