package/ci: find and compile against Apple's OpenCL implementation di…

…rectly

Apple's OpenCL implementation doesn't seem to support being used through
the ICD, so you have to compile against it directly or use a wrapper.

See also:
https://portablecl.org/docs/html/using.html#using-pocl-on-macosx
https://github.com/jrprice/ocl_icd_wrapper

package/ci/circleci.yml

@@ -520,7 +520,7 @@ jobs:
       DISABLE_OPENCL: "ON"
     steps:
     - install-base-macos:
-        extra: faad2 harfbuzz assimp devil spirv-tools glslang openexr webp wget zstd libspng opencl-icd-loader pocl
+        extra: faad2 harfbuzz assimp devil spirv-tools glslang openexr webp wget zstd libspng
     - install-basis
     - install-meshoptimizer
     - build:
@@ -536,7 +536,7 @@ jobs:
       CONFIGURATION: Debug
     steps:
     - install-base-macos:
-        extra: faad2 harfbuzz assimp devil spirv-tools glslang openexr webp wget zstd libspng opencl-icd-loader pocl
+        extra: faad2 harfbuzz assimp devil spirv-tools glslang openexr webp wget zstd libspng
     - install-basis:
         tag: "1.16.4"
     - install-meshoptimizer