Revert "Workaround OpaquePointers for LLVM 15"
Revert "Workaround OpaquePointers for LLVM 15"

This reverts commit a277ec42102c463d656df8f64eb2f7e87e322210.

Opaque pointers are now properly supported.

iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace