RFC: update to HACKING

[Robert Schuster]

Hi,
I updated HACKING with some info I found valuable as being not so experienced
with GCJ build machinery.

Ok, for commit?

Btw: Mark told me that there is some automatic that makes GCJ use the correct
file when natFooPosix, natFooWindows and natFooEcos are available but only
natFooPosix is part of the nat_source_files variable. Can someone explain this
to me or add the neccessary info to HACKING after I applied this patch?

ChangeLog:

2006-10-03  Robert Schuster  <robertschuster@fsfe.org>

        * HACKING: Added info about adding/removing C++ source files,
        applied minor corrections, added index and captions.

cya
Robert
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