Import zconf.h, necessary for compilation

I'm actually surprised we had missed it before...

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@631 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Make the compilation succeed on windows

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@632 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Go as far as possible in the compilation on windows even if pdflatex is missing, ie do not abort before displaying the message that pdflatex could not be found !

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@633 f6f669a6-2b79-499e-8f05-be2b991fc3d0
Holy gods, PDF files are BINARY files ;-)...

Tioga now works on windows !

git-svn-id: svn+ssh://rubyforge.org/var/svn/tioga/trunk/tioga@634 f6f669a6-2b79-499e-8f05-be2b991fc3d0