dev-util/opencl-headers: Import from upstream

We've been installing the OpenCL headers from our custom repo at
src/third_party/khronos. But that repo is out of date.

As precedent, we've already done the migration for
dev-util/spirv-headers, and have always used dev-util/vulkan-headers.

Add a RDEPEND blocker to work around file conflicts, as explained in

TEST=emerge-$BOARD opengles-headers opencl-headers

Cq-Depend: chromium:3149592
Change-Id: Id7f559851be2bccbcc9b6e837a4cfdb3f809b31b
Tested-by: Chad Versace <>
Reviewed-by: Ilja H. Friedel <>
Reviewed-by: Romaric Jodin <>
Commit-Queue: Chad Versace <>
3 files changed