Lagom/CMake: Add -fconstexpr-steps for AppleClang

Author: https://github.com/pakerwreah
Commit: https://github.com/SerenityOS/serenity/commit/69e2431c645
Pull-request: https://github.com/SerenityOS/serenity/pull/6770

Meta/Lagom/CMakeLists.txt

@@ -7,7 +7,7 @@ else()
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++2a -fPIC -g -Wno-deprecated-copy")
 endif()
 
-if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang$")
     # Clang's default constexpr-steps limit is 1048576(2^20), GCC doesn't have one
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-overloaded-virtual -Wno-user-defined-literals -fconstexpr-steps=16777216")