INSTALL.Cygwin: Update list of packages to install
As I'm installing fresh cygwin environment for freeciv compilation, I'm reviewing and updating package list in INSTALL.Cygwin in the process.
The difference between branches is how to document libbz2 that is in process of deprecating and getting obsolete.
As I'm installing fresh cygwin environment for freeciv compilation, I'm reviewing and updating package list in INSTALL.Cygwin in the process.