CMake: Require LLVM 17 or later

API changes necessitate an update here.

CMakeLists.txt

@@ -289,7 +289,7 @@ find_package(Boost 1.79.0 REQUIRED context)
 find_package(enet 1.3 MODULE)
 find_package(fmt 9 REQUIRED)
 find_package(inih 52 MODULE COMPONENTS INIReader)
-find_package(LLVM MODULE COMPONENTS Demangle)
+find_package(LLVM 17 MODULE COMPONENTS Demangle)
 find_package(lz4 REQUIRED)
 find_package(nlohmann_json 3.8 REQUIRED)
 find_package(Opus 1.3 MODULE)