A-line:  Only pass -Wno-non-template-friend on PPC

The warning in question isn't generated by the gcc that ships with Xcode
10.4 and later, so this option isn't needed on Intel, and clang *issues*
a warning because it doesn't recognize the option.
[DEL] qd:  Remove obsolete SetCPixel() wrapper
Nitrogen:  Move ControlData_Tag to its own unit