[mako][environment] add gstreamer vars for multimedia

Change-Id: Ib896aa33df27a3edf6acfde78d9a34b75db50616
Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>
[mako][patterns] for jolla-camera and usb-moded

Change-Id: Ia3b4eb5152bec1f68ac1d699e4d9ecc05940bb97
Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>
Merge pull request #57 from sledges/patterns-rc4

Mako patterns update