i#58 MacOS: query_time_seconds() and SYS_gettimeofday quirk
i#58 MacOS: query_time_seconds() and SYS_gettimeofday quirk

To implement query_time_seconds(), use SYS_gettimeofday as there is no
SYS_time on Mac.

On Mac, SYS_gettimeofday returns usecs:secs instead of writing to the
timeval struct arg, requiring special support.

SVN-Revision: 2450

daksunt/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,AmesianX/dynamorio,daksunt/dynamorio,daksunt/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,daksunt/dynamorio,code4bones/dynamorio,sigma-random/dynamorio,bl4ckic3/dynamorio,AmesianX/dynamorio,AmesianX/dynamorio,sigma-random/dynamorio,AmesianX/dynamorio,code4bones/dynamorio,bl4ckic3/dynamorio,sigma-random/dynamorio,sigma-random/dynamorio,code4bones/dynamorio,code4bones/dynamorio