gnu: appimage: New packages for the appimage runtime....* gnu/packages/appimage.scm
(gnu packages appimage): New module.
(appimage-type2-runtime): New variable.
* gnu/packages/file-systems.scm (squashfuse-for-appimage):
New variable.
* gnu/packages/linux.scm (fuse-for-appimage): New variable.
Change-Id: I857a8eb5399a6a493e52db70b6c8cf0c71360930
Signed-off-by: Ludovic Courtès <ludo@gnu.org>