dtrace tests: fix prototypes for gcc build

- quiet -Wstrict-prototypes
- provide prototypes for weak aliases

Reviewed by: markj
Sponsored by: Dell EMC Isilon
Differential Revision: https://review

dtrace tests: fix prototypes for gcc build

- quiet -Wstrict-prototypes
- provide prototypes for weak aliases

Reviewed by: markj
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D28036

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Address compiler warnings in C code used by the DTrace test suite.

Reported by: Jenkins
MFC after: 1 week

This commit was generated by cvs2svn to compensate for changes in r178476,
which included commits to RCS files with non-trunk default branches.