Dropping recommendation to install system headers / command line tools

[Jan Stary]

On Jul 04 03:10:38, ryandesign at macports.org wrote:
> Last I checked, graphite2 would not build if CLTools were not installed:
> https://trac.macports.org/ticket/49325

On a related note: a comment in this ticket says that

	xcode-select -p does not show whether you have
	the command line tools installed.

Yet that's exactly what "port diagnose" uses.
https://trac.macports.org/ticket/53909

	Jan