Fix test failure on non-x86 architectures

Tested on Fedora, where without this the build fails:

libspa:

• with patch: https://koji.fedoraproject.org/koji/buildinfo?buildID=1910817

pipewire:

• with patch: https://koji.fedoraproject.org/koji/buildinfo?buildID=1910805
• without patch: https://koji.fedoraproject.org/koji/taskinfo?taskID=82212223

Fixes #35 (closed).

Signed-off-by: Michel Alexandre Salim salimma@fedoraproject.org