[syslog-ng] New files for contrib/cygwin-packaging

Hi, so far I didn't upgrade Cygwin's syslog-ng beyond 2.1.x. The changes in 3.0 require to change the Cygwin specific files in the contrib directory. Both files are attached. Could these both please applied to the syslog-ng repository? Thanks in advance, Corinna -- Corinna Vinschen Cygwin Project Co-Leader Red Hat