remove hardcoded compiler optimizations and -g

Index: CMakeLists.txt
--- CMakeLists.txt.orig
+++ CMakeLists.txt
@@ -449,9 +449,9 @@ else ()
 		set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -mthreads")
 	endif ()
 
-	set(CMAKE_CXX_FLAGS_DEBUG           "${CXX_FLAGS_DEBUG_ADDITIONAL} -O0     ${DEBUG_WARNINGS}  ${CXX_DEBUG_DEFINES}")
-	set(CMAKE_CXX_FLAGS_RELWITHDEBINFO  "${CXX_FLAGS_DEBUG_ADDITIONAL} -O2     ${COMMON_WARNINGS} ${CXX_RELWITHDEBINFO_DEFINES}")
-	set(CMAKE_CXX_FLAGS_RELEASE         "                              -O2     ${COMMON_WARNINGS} ${CXX_RELEASE_DEFINES}")
+	set(CMAKE_CXX_FLAGS_DEBUG           "${CXX_FLAGS_DEBUG_ADDITIONAL} ${DEBUG_WARNINGS}  ${CXX_DEBUG_DEFINES}")
+	set(CMAKE_CXX_FLAGS_RELWITHDEBINFO  "${CXX_FLAGS_DEBUG_ADDITIONAL} ${COMMON_WARNINGS} ${CXX_RELWITHDEBINFO_DEFINES}")
+	set(CMAKE_CXX_FLAGS_RELEASE         "${COMMON_WARNINGS} ${CXX_RELEASE_DEFINES}")
 
 	set(CMAKE_CXX_FLAGS_DEBUG          "${CMAKE_CXX_FLAGS_DEBUG} -ggdb")
 	set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -g")
