Fix quiet compilation to print the user's CFLAGS, CXXFLAGS, LDFLAGS.

Fix quiet compilation to print the user's CFLAGS, CXXFLAGS, LDFLAGS.

The only reason I ever call "make V=1" myself, (other than when
debugging the compiler command-line for some reason), is to ensure
whether my CFLAGS, (like "-g -O0" or "-O2"), are actually making it to
the command-line.

But these are hard to find in the V=1 output, and really, we should
just print these even in the quiet case. So do that.