Use libc's strndup() instead of Dtrace's reimplementation.

Corresponds partially to OpenSolaris change:
PSARC 2010/299 GNU/Linux/BSD compatibility functions
6901783 strndup would be nice

MFC after:

Use libc's strndup() instead of Dtrace's reimplementation.

Corresponds partially to OpenSolaris change:
PSARC 2010/299 GNU/Linux/BSD compatibility functions
6901783 strndup would be nice

MFC after: 2 weeks

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MFV OpenSolaris DTrace userland bits.

This commit was generated by cvs2svn to compensate for changes in r178479,
which included commits to RCS files with non-trunk default branches.