Upgrade libgltf to 0.0.2

News in this version:
 - Better positioning of the models (fdo#81181)
 - Increased robustness (some additional check and coverity scan)

Change-Id: I5be6a99eb925881ed84c8791ef39390e29cbb88b
Reviewed-on: https://gerrit.libreoffice.org/11749
Reviewed-by: Zolnai Tamás <tamas.zolnai@collabora.com>
Tested-by: Zolnai Tamás <tamas.zolnai@collabora.com>