cxxCompressor.py: replace map() with for-loop when running 'collapse_hintmask'
cxxCompressor.py: replace map() with for-loop when running 'collapse_hintmask'

https://github.com/googlei18n/compreffor/pull/13#discussion_r63275818

anthrotype/compreffor,anthrotype/compreffor,googlei18n/compreffor,googlei18n/compreffor,googlefonts/compreffor,googlei18n/compreffor,behdad/compreffor,behdad/compreffor,anthrotype/compreffor,behdad/compreffor,moyogo/compreffor,moyogo/compreffor,moyogo/compreffor,googlefonts/compreffor