RFC src/configure* - "CFLAGS=-g -O" instead of "CFLAGS=... -Wall"

[Andrew Cagney]

Hello,

At present the top level configure + Makefile.in force (when GCC) CFLAGS
to:

	CFLAGS = -g -O -Wall

I'd like to scale that back to just:

	CFLAGS = -g -O

letting each sub directory set their own -W* policy.  The src/gdb and
src/sim directories try to do this now using separate WARN_CFLAGS (only
they get overuled by CFLAGS :-).


	enjoy,
		Andrew