cache.h breaks whowatch port

[Daniel Harris]

Hello,

I maintain the whowatch port, which is currently failing on bento with the 
following (on sparc64):

proctree.c:107: conflicting types for `cache'
/usr/include/machine/cache.h:111: previous declaration of `cache'

which is from src/sys/sparc64/include/cache.h,v 1.8:

extern struct cacheinfo cache;

Is the namespace collision a fault of the software or of the sparc64 header?
If it's the software (whowatch)'s fault, please advise me on how to fix this.

Thanks,

-- 
Daniel Harris