Move macros wrapping functions from msg.h into msg.h

This makes code reusing easier.

ATF t_ptrace_wait*: Disable debug messages in msg.h

msg.h is a dummy IPC interface.

Disable additional debugging logging here, especially wanted in race*
tests.

Sponsored by <The NetBSD Foundation>

Import ptrace(2) tests into appropriate directory tests/lib/libc/sys/

This is the correct directory documented in tests/README for such tests.

Discussed with <martin>

Sponsored by <The NetBSD Foun

Import ptrace(2) tests into appropriate directory tests/lib/libc/sys/

This is the correct directory documented in tests/README for such tests.

Discussed with <martin>

Sponsored by <The NetBSD Foundation>

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