Bump external/OpenCL-Headers from e049b16 to 5e3df1c (#73)

Bumps [external/OpenCL-Headers](https://github.com/KhronosGroup/OpenCL-Headers) from `e049b16` to `5e3df1c`.
- [Release notes](https://github.com/KhronosGroup/OpenCL-Headers/releases)
- [Commits](KhronosGroup/OpenCL-Headers@e049b16...5e3df1c)

---
updated-dependencies:
- dependency-name: external/OpenCL-Headers
  dependency-type: direct:production
...

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