Cirrus CI: dump both the Windows and UN*X environments.

Just dump the full environment.

Author: guyharris

.cirrus.yml

@@ -84,8 +84,8 @@ windows_task:
     - curl -o AirPcap_Devpack.zip -L -s "https://support.riverbed.com/bin/support/download?sid=l3vk3eu649usgu3rj60uncjqqu"
     - 7z x .\AirPcap_Devpack.zip -oc:\projects\libpcap\Win32
   script:
-   - set %PATH%
-   - sh -c "echo $PATH"
+   - set
+   - sh -c "env"
    - sh -c "./build_matrix.sh"
 
 coverity_task: