xbmc: update to xbmc-14-c7e8459
xbmc-pvr-addons: update to xbmc-pvr-addons-a6c2ec7
gettext: update to gettext-0.19.2

Signed-off-by: Stephan Raue <stephan@openelec.tv>
linux: update to linux-3.15.6

Conflicts:
	packages/linux/package.mk