[libgfortran,patch] Remove never-used debugging code

[FX]

Continuing the summer clean-ups.

There is in the init() function some dead debugging code, which as far as I 
know is never used: it’s compiled conditionaly on DEBUG being defined, and but 
we don’t have anything that can define DEBUG. The commented-out “resume” 
functionality was never implemented in gfortran. And show_variables() isn’t 
very useful.

OK to commit to trunk?

FX

unusedcode.ChangeLog
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unusedcode.diff
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