build: Fix CMake Clang Debug build check

CMakeLists.txt

@@ -129,7 +129,7 @@ if(${CMAKE_CXX_COMPILER_ID} MATCHES "(GNU|Clang)")
             -Wstring-conversion
         )
 
-        if (CMAKE_BUILD_TYPE EQUAL "DEBUG")
+        if (CMAKE_BUILD_TYPE MATCHES "Debug")
             # When using tools such as lldb, strings will produce "error: summary string parsing error"
             add_compile_options(-fstandalone-debug)
         endif()