Test system-libunwind fails on Ubuntu

[dviererbe]

++ ../dotnet-directory --framework 8.0.2
+ framework_dir=/usr/lib/dotnet/shared/Microsoft.NETCore.App/8.0.2
+ libcoreclr=/usr/lib/dotnet/shared/Microsoft.NETCore.App/8.0.2/libcoreclr.so
+ ldd /usr/lib/dotnet/shared/Microsoft.NETCore.App/8.0.2/libcoreclr.so
        linux-vdso.so.1 (0x00007ffd987c9000)
        libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007cf170729000)
        libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007cf1704ac000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007cf1703c3000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007cf1701b1000)
        /lib64/ld-linux-x86-64.so.2 (0x00007cf170e7c000)
+ set +e
+ ldd /usr/lib/dotnet/shared/Microsoft.NETCore.App/8.0.2/libcoreclr.so
+ grep -F libunwind.so
+ retval=1
+ set -e
+ '[' 1 -eq 0 ']'
+ set +e
+ ldd /usr/lib/dotnet/shared/Microsoft.NETCore.App/8.0.2/libcoreclr.so
++ uname -m
+ grep -F libunwind-x86_64.so
+ retval=1
+ set -e
+ '[' 1 -eq 0 ']'
+ echo 'fail: No linkage to libunwind found'
fail: No linkage to libunwind found
+ exit 1

[dviererbe]

Also fails with .NET 7.0.116

[dviererbe]

Succeeds with .NET 6.0.127