clc: disable opaque pointers until they are supported

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <!16479>
174 jobs for !16479 with clc/llvm-15 in 43 minutes and 33 seconds (queued for 9 seconds)
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