add missing dlls to windows installer

git-svn-id: http://svn.code.sf.net/p/texstudio/code/trunk@4117 92cce386-e96d-4106-809f-596c673a3fd8
fix synctex compiler warnings

git-svn-id: http://svn.code.sf.net/p/texstudio/code/trunk@4118 92cce386-e96d-4106-809f-596c673a3fd8