install pkg-config if it is not already installed

KhronosGroup / OpenCL-Headers

Khronos OpenCL-Headers

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install pkg-config if it is not already installed #219

Closed bashbaug closed 1 year ago

bashbaug commented 1 year ago

Looks like pkg-config is no longer available by default in the macos-11 image. This PR checks to see if pkg-config is available and installs it if it isn't. Needed to fix macOS CI.