[lldb/cmake] Normalize use of HAVE_LIBCOMPRESSION (#135528) I *think* this was the reason behind the failures in 2fd860c1f559c0b0be66cc000e38270a04d0a1a3: the clang include tool showed the Config.h headers as unused, and because the macro was referenced through an `#ifdef`, its removal didn't cause build failures. Switching to `#cmakedefine01` + `#if` should make sure this does not happen again. According to D48977, the `#ifndef`+`#cmakedefine` patterns is due to some files redefining the macro themselves. I no longer see any such files in the source tree (there also were no files like that in the source tree at the revision mentioned, but the macro *was* defined in the hand-maintained XCode project we had at the time).
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