OpenShadingLanguage-1.10.7-bp152.2.20

- Properly rebase 0001-Generalize-lookup-of-stdosl.h-in-install-directory-a.patch
  avoid workarounds in the spec file.
- Remove conditional code for Leap 42.x
- Reflect required versions of OpenIIO and Clang in the spec file.

- Update to release 1.10.7 which fixes build with new llvm.
- Rebased:
  0001-Generalize-lookup-of-stdosl.h-in-install-directory-a.patch
- Recent upstream changes:
  * Adjust for deprecated material in more recent Qt releases. #1043
  * Fixes for MinGW compiler. #1047
  * Texture "missingalpha" optional parameter generated incorrect
  code and crashed. #1044
  * Fix incorrect optimizations surrounding 'exit()' calls in the
  middle of certain shader code blocks. #1051
  * LLVM 9 / clang 9 compatibility. #1058
  * Fixes to Travis CI system to keep up with OIIO master recently
  upgrading its minimum required CMake. #1065

- Fix lookup of stdosl.h from oslc (bnc#1123254):
  Dropped OpenShadingLanguage-shaderinstalldir.patch
  Added 0001-Generalize-lookup-of-stdosl.h-in-install-directory-a.patch
- Cleaned up spec file (defattr)
- Correct LLVM_MCJIT_LIBRARY value, add comment
- Use current LLVM for building (bnc#1123252)
- Split shaders in common-headers, MaterialX-shaders and example-shaders
  subpackages. stdosl.h in common-headers is required by oslc in
  the main package (bnc#1123254).
- Correct clang-devel package name for Leap 42.3

- Spruce up descriptions a bit.

- Initial version 1.9.13 created for blender see boo#1120406
- Blender fails to build with 1.10.x versions
- Added OpenShadingLanguage-shaderinstalldir.patch shaders are
  installed directly under /usr see:
  https://github.com/imageworks/OpenShadingLanguage/issues/955