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Translating #ifdef

I've made the following mods to the translator for producing
conditional compilation expressions:

FOO ifdef: [stuff] else: [stuff2]

translates to:

#ifdef FOO
#else /* FOO */
#endif /* FOO */

and executes just like ifTrue:ifFalse: (you should put some code in
Heaper linkTimeNonInherited to initialize the global variable FOO).
#ifndef is also supported, and the #else cases can be omitted.

If you want an entire member function to be conditional, you can put
ifdefFOO or ifndefFOO in the return type. I will probably add
conditionally compiled instance variables as well.