nvidia-texture-tools-2.0.8-bp151.2.12

- Update project and download url
- Cleanup spec file with spec-cleaner
- Drop support for distributions without cmake macros as they are
  all out of support now.
- Correct encoding of license files

- nvidia-texture-tools-gcc6.patch: replace some "return false;" by
  "return NULL;" to have a pointer return.

- Update to version 0.8-1
  * Fix float to fixed image conversion. Fixes issue 121.
  * ColorBlock::isSingleColor compares only RGB channels. Fixes issue 115.
  * Fix cmake build in msvc. Fixes issue 111.
  * Better estimate principal component. Fixes issue 120.
- Use %cmake macro for openSUSE > 12.3
- Remove redundant %clean section

- package builds also with libpng15

- use standard linux types instead of relying on own copies

- Add nvidia-texture-tools-gcc47.patch: Fix build with gcc 4.7.

- add ExclusiveArch tag in specfile

- remove windows binaries from tarball bnc#522208

- initial import of version 2.0.6
  - nvidia helper libraries for various texture operations