gnu: Fetch several Git sources over HTTPS.

gnu: Fetch several Git sources over HTTPS.

* gnu/packages/admin.scm (interrobang)[source]: Use HTTPS URL.
* gnu/packages/audio.scm (ardour)[source]: Likewise.
* gnu/packages/embedded.scm (libjaylink, openocd)[source]: Likewise.
* gnu/packages/gnome.scm (byzanz)[source]: Likewise.
* gnu/packages/gnunet.scm (guile-gnunet)[source]Likewise.
* gnu/packages/java.scm (classpath)[source]: Likewise.
* gnu/packages/microcom.scm (microcom)[source]: Likewise.
* gnu/packages/python.scm (python-axolotl-curve25519)[source]: Likewise.
* gnu/packages/rdesktop.scm (freerdp)[source]: Likewise.
* gnu/packages/shells.scm (rc)[source]: Likewise.
* gnu/packages/web.scm (libwebsockets)[source]: Use new source URL.