logger script

[Kelly O'Hair]

The logger mechanism (common/bin/logger.sh) is clever and everything, but it appears to be
costing us build time (10% on some platforms) and more importantly build stability on windows.
Fancy shell exec logic doesn't seem to be as reliable on windows and just slows it down badly. :^(

My tendency is to have it default to being off (e.g. have BUILD_LOG_WRAPPER be empty)
unless we can determine we have a developer doing a build.
Or alternatively we need some kind of 'batch build' setting for build systems.

I'm open to ideas here.

-kto