glTF rendering: workaround for camera movements

If the glTF contains camera movement in it moving camera
by keyboard didn't work very well.

Change-Id: I9300a257858d4f35c2d622654a0c2fd85eedc5ed
(cherry picked from commit 968b7f807561339d0083fe0aa6e893983ca60456)
Patching libgltf: fix wrong deallocation method

Change-Id: I05c5650c1e43cf9ac4156e8d74073bf92ac0c4df
(cherry picked from commit 3ce0f83cec6d2ee1467523209df633c5a2487f71)