r813: gcc has fixed its huge debug sizes with -g now, so drop the -gstabs,

r813: gcc has fixed its huge debug sizes with -g now, so drop the -gstabs,
allowing us to use a more standard debug format.

If you want it even smaller than I recommend the
-feliminate-dwarf2-dups option, if your version of gcc supports it.
(This used to be commit a11340a971af24d9dcab720f92483b0dafa01142)