clean build without  [-Wno-write-strings] flag
clean build with [ -Wignored-qualifiers] flag
build with [-Wunsafe-loop-optimizations] flag
Fix all warnings , leaving all code compatible with existing options.
	modified:   ../Dialogs/dlgMultiSelectList.cpp
	modified:   DrawFlarmRadar.cpp
	modified:   DrawTRI.cpp
	modified:   MapWindow_Events.cpp
	modified:   MapWndProc.cpp
	modified:   Multimaps/RenderAirspace.cpp
Disable from Makefile unsupported compiler options