alljoyn: new package

alljoyn: new package

The AllJoyn framework defines a common way for devices and apps to
communicate with one another regardless of brands, categories,
transports, and OSes. Developers write applications that discover
nearby devices, and communicate with each other directly and through
the cloud, unleashing new possibilities in the Internet of Things.

https://allseenalliance.org

Signed-off-by: Fabrice Fontaine <fabrice.fontaine@orange.com>
Reviewed-by: Romain Naour <romain.naour@gmail.com>
[Thomas:
 - rewrap Config.in help text
 - remove / at the beginning of the ALLJOYN_DISTDIR variable.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>