Workaround for compilation error introduced in r54755

Scons used to fail because of couple of reasons:

- CMake does have WITH_DNA_GHASH enabled, Scons not
  Which is a good question why?!
- This makes Cmake including BLI_utildefines in dna_genfile.c,
  but scons missed this include
- This damn "bool" thing requires BLI_utildefines

And last question here is why would we want to use bool here =\
It's just always ends up in headache without any visible benefit
of using it.

Well, at least now svn shall be compilable again..

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54762 954f8c5b-7b00-dc11-b283-0030488c597c