Cleanup SConstruct file.
All languages are equal-value-citizens now.
All Alcor6L languages are equal-value-citizens.

The generic platform module code for langauges
will now exist within their own individual #ifdef
and #endif block. (suggested by Martin Guy)

Example snip:

 #if defined ALCOR_LANG_PICOLISP
   // do something here.
 #endif

 #if defined ALCOR_LANG_PICOC
   // do something else.
 #endif
shell system: All languages are equal-value-citizens.
Fix conditional compilation style - as with the
previous commit.

This is exclusively for the avr32 platform layer
and specifically for Mizar32. We still have work
to do for lm3s and stm32 but we'll get to that
later.