coccinelle: help Coccinelle with some more complex macros

coccinelle: help Coccinelle with some more complex macros

Drop the original macro file, since it's not needed anymore thanks to
resolving includes properly, but introduce a similar file -
parsing_hacks.h - that helps Coccinelle in some specific corner cases.

This eliminates most of the outstanding parsing errors in source files.
The remaining ones are limitations of the parsing engine (see the FIXMEs
in pasing_hacks.h) and need further investigation.