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Fix DTrace test tst_inet_ntop_d: remove definitions are already in libdtrace

Description

Fix DTrace test tst_inet_ntop_d: remove definitions are already in libdtrace

We have D definitions for the named values in socket.h after r323253. Remove
them in test script to prevent compiling failure.

Reviewed by: markj, gnn
Differential Revision: https://reviews.freebsd.org/D12334

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