Improve test-ptrace portability #549
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Commit 06468ef has changed /bin/ls to ls for NixOS compatibility, however this is wrong for FreeBSD which is uses execve syscall. For better portability use execvpe if present or fallback to execve.
Unfortunately, FreeBSD, in addition to PT_SYSCALL, also defines PTRACE_SYSCALL with a different meaning. Prefer PT_SYSCALL if present.
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Fix for FreeBSD, second try.