[Bug 198296] math/fftw3: upgrade, fix the "SSE but not SSE2" systems

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=198296

            Bug ID: 198296
           Summary: math/fftw3: upgrade, fix the "SSE but not SSE2"
                    systems
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: bf at FreeBSD.org
          Reporter: mi at ALDAN.algebra.com
             Flags: maintainer-feedback?(bf at FreeBSD.org)
          Assignee: bf at FreeBSD.org

Created attachment 153812
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=153812&action=edit
Do not assume, that SSE means SSE2 -- only enable SSE2 if explicitly requested

The existing port builds version 3.3.3, while the newer release -- 3.3.4 -- is
available.

Both 3.3.3 and 3.3.4 have a problem with systems, where SSE is among
processor-features, but SSE2 is not. For some reason, upstream code interprets
"--enable-sse" to ALSO mean "--enable-sse2":

https://github.com/FFTW/fftw3/issues/35

The attached patches attempts to both update our port to 3.3.4 and fix the
SSE2-presumption.

It seems to build fine here (used for fftw3-float) and pass the "check" as well
("bigcheck" is just too long for this little Athlon).

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