Building OpenJDK with debuginfo

[Andrew Haley]

I noticed that debugging IcedTea is difficult, and I've found the core
problem: ecj defaults to generating minimal debuginfo, basically just
line numbers.  GNU/Linux distributions usually have a rule that
debuginfo is enabled for all packages, and I can't think of any reason
not to do that now with IcedTea.  Debuginfo is going to be non-negotiable
in a real release package anyway.

So, I'll fix the Makefiles to use "-g" throughout.

Andrew.

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