Due to the fact that people follow terrible guides that ignorantly
recommend opencl, the "opencl" custom x264 option was blocked. However,
because some people still apparently want to use it, it's being renamed
to "opencl_is_experimental_and_potentially_unstable" so that anyone who
uses this option realizes that they should probably think twice about
using the option rather than just follow some terrible guide that tells
them to use it.
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