makefile.flags: do not use -O with -g

[Mike Frysinger]

On Sunday 17 February 2008, walter harms wrote:
> i had a situation where the -Os option confused my debugger.
> This little patch disables the -Os when -g is used.

fix your debugger or dont build with -Os.  if you need to debug something, you 
shouldnt be enabling any optimizations in the first place.
-mike
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