add spirv cross/20200629

[SpaceIm]

Specify library name and version: spirv cross/20200629

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[conan-center-bot]

Some configurations of 'spirv-cross/20200629' failed in build 1 (e7650a06bd6ff3d0143602682270bc9745539b12):

• Windows x86_64, Debug, Visual Studio 15, MDd. Options: spirv-cross:shared-True
  • Log download
  • Log error Download
  • Profile
• Access to all the logs
• Windows x86_64, Debug, Visual Studio 15, MDd. Options: spirv-cross:shared-False
  • Log download
  • Log error Download
  • Profile
• Access to all the logs
• Windows x86_64, Release, Visual Studio 15, MD. Options: spirv-cross:shared-True
  • Log download
  • Log error Download
  • Profile
• Access to all the logs
• Windows x86_64, Release, Visual Studio 15, MT. Options: spirv-cross:shared-False
  • Log download
  • Log error Download
  • Profile
• Access to all the logs
• Windows x86_64, Release, Visual Studio 15, MD. Options: spirv-cross:shared-False
  • Log download
  • Log error Download
  • Profile
• Access to all the logs

[conan-center-bot]

All green in build 2 (e7650a06bd6ff3d0143602682270bc9745539b12)! 😊

• spirv-cross/20200629: Generated 130 packages. All logs here
• spirv-cross/20200519: Generated 130 packages. All logs here
• spirv-cross/20200403: Generated 130 packages. All logs here