Don't use tempnam on UNIX
Don't use tempnam on UNIX

This silences the huge stream of warnings when building the tests.

I think I didn't break the Windows version in the process (though
it may make sense to use the built in Windows functions there
instead), but I don't have a Windows build environment here, so
I can't test.

Distrotech/taglib,videolabs/taglib,davispuh/taglib,Distrotech/taglib,TsudaKageyu/taglib,i80and/taglib,MaxLeb/taglib,taglib/taglib,videolabs/taglib,TsudaKageyu/taglib,dlz1123/taglib,Distrotech/taglib,i80and/taglib,videolabs/taglib,TsudaKageyu/taglib,davispuh/taglib,MaxLeb/taglib,black78/taglib,pbhd/taglib,taglib/taglib,davispuh/taglib,MaxLeb/taglib,black78/taglib,pbhd/taglib,dlz1123/taglib,black78/taglib,taglib/taglib,pbhd/taglib,i80and/taglib,dlz1123/taglib