Make `make tinderbox` work with MAKEOBJDIRPREFIX set (or in possibly other combinations) by forcing FAILFILE into .CURDIR as we do for all other universe output files. [1]  Similarly make FAILFILE start with "_." as well.
Make `make tinderbox` work with MAKEOBJDIRPREFIX set (or in possibly other
combinations) by forcing FAILFILE into .CURDIR as we do for all other
universe output files. [1]  Similarly make FAILFILE start with "_." as well.

Reviewed by:	silence-on-src [1]
MFC after:	6 days

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