DIB Engine - Rebased on current tree (Takes 2) - Part one - GDI32 patches

[Massimo Del Fedele]

As there where some changes on GDI32 in latest commits, previous testing 
  DIB Engine had to be modified too.
I'm posting here (and in bug 421 page) the 2 needed patches, separated 
by GDI32 changes and winedib.drv folder.
In order to keep patches smaller, I dropped the autogenerated 
'configure', but leaving 'configure.ac'.... I guess this is the correct 
way, probably an autoconf is needed to regenerate the configure file.

I was asked to separate the commits from Huw Davies, Jesse Allen and me, 
but as I changed most of the original author's code It'll be somehow 
difficult and, imho, will make few sense. It can be done, but that would 
mean to post a great number of patches with the final result quite 
different from the original one.
I let of course the original copyright notices inside files; I'd like 
original author's opinion if for them is enough.

Instructions on how to enable/disable the engine as the same as previous 
post, and are detailed in BUG 421 page.

First part -- GDI32 patches

Ciao

Max