Optional update to add libtxc_dxtn to the distribution
This update adds libtxc_dxtn to the distribution.
libtxc_dxtn is an S3TC implementation for mesa with full S3TC compression and decompression support.
- Submitted by Ondřej Súkup (mimi_vx)
Fixed bugs
bnc#1063424
Add libtxc_dxtn to Leap