[flashrom] [RFC] #ifdef or #if defined()

[Carl-Daniel Hailfinger]

Right now flashrom uses a mix of #ifdef and #if defined() and due to
that, readability suffers.

Should we use #if defined() everywhere and kill #ifdef? Should we
evaluate the preprocessor defines for their value instead of their
presence to avoid strange problems once someone defines anything to 0?

Regards,
Carl-Daniel