Reduce make Init.gmk logging overhead

The Init.gmk and InitSupport.gmk makefiles provide the foundational framework for bootstrapping the build. That bootstrap process has grown over time and is starting to take significant time to execute on Windows. One reason for this is that every extra command executed at this level gets the whole build log piping construct added to it. On Windows, this amounts to quite a few extra processes.

I would like to reduce this by introducing a simpler log piping construct for commands that are not expected to generate both stdout and stderr output, typically simple "echo" and "printf" statements. For these a simple "| tee -a <logfile>" should suffice.

This change slightly improves incremental build performance on Windows.