[CVS ci] make: print filenames only

[Leopold Toetsch]

Echoing all compiler flags clutters the screen too much, so that 
warnings easily can get missed.
Earlier I used to run "make -s" which silents "make".
Still better would be:
- echo compiler flags once
- echo filenames only
- let the work depending on "-s" was given to "make" or not or such

leo