Add DLL support on Windows platforms.
Numerous minor bug fixes related to Windows platforms.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@2420 72102866-910b-0410-8b05-ffd578937521
unused variables MS and DS. Avoid warning by not trying to sprintf()
a zero-length string.
git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@1911 72102866-910b-0410-8b05-ffd578937521