Bug#1086489: xsimd: autopkgtest is failing on arm64

[Drew Parsons]

Control: forwarded 1086489 https://github.com/xtensor-stack/xsimd/issues/1066

Emilio's verbose log shows

2885s 1: /tmp/autopkgtest-lxc.8mniqst8/downtmp/build.OlH/src/test/test_xsimd_api.cpp:631: ERROR: CHECK_EQ( extract(xsimd::lgamma(T(val))), std::lgamma(val) ) is NOT correct!
2885s 1:   values: CHECK_EQ( -nan, 0 )


i.e. the problem is that lgamma is returning -nan when built with clang 19 on arm64.

Not clear from the error whether the fault lies with xsimd or with clang.
Bug filed with xsimd upstream.