libsoxr: FTBFS on arm64 and armhf

[Edmund Grimley Evans <edmund.grimley.evans@gmail.com>]

The buildds don't seem to have had a problem with this package.
However, when I tried it with dpkg-buildpackage -b, 8 out 9 tests
failed on both arm64 and armhf.

However, I can build it on both architectures if I disable OpenMP:

mkdir build
cd build
cmake -DWITH_OPENMP:BOOL=OFF ..
make
make test

I've not reported this as a bug because perhaps it's somehow my fault,
or a known transitional problem with OpenMP.

Can anyone confirm this problem or suggest a solution?