Please review - security patch 7622253

[Moritz Bandemer]

Please review - security patch 7622253

I've merged the following patch:
https://android.googlesource.com/platform/frameworks/base/+/68b13ba
Secure broadcasts, which prevents 3rd party spoofing.
Bug: 7622253
Patch-file: Bugfix-7622253.patch
to the Replicant sources and successfully recompiled/flashed Replicant 
after that for/on my device.
Finally I've tested this productive device several weeks without any 
misbehavior.

Replicant ticket reference: http://redmine.replicant.us/issues/1263
Please review the patch attached and apply it, if you like.