Hide warnings about standard C functions being deprecated.
Optimize a few things for the new environment.
Allow project files to work on FAT32 directories.
X-SVN-Rev: 20772
This change is also being done so that it's easier to compare the options against the Cygwin/MSVC build (the only way left to use MSVC 6).
Some of the definitions/options aren't used at all or are redundant.
X-SVN-Rev: 17285