MFC r276823:
Add makefile for the "osmtest" utility. While at it:
- Fix depend target by removing a space after an "-I" inclusion option.
- Fix some minor compile issues in the "osmtest" utility.

PR: 196580

Add makefile for the "osmtest" utility. While at it:
- Fix depend target by removing a space after an "-I" inclusion option.
- Fix some minor compile issues in the "osmtest" utility.

MFC after: 3 days
PR: 196580
Sponsored by: Mellanox Technologies