[C++] Do not set non standard optimizations in Release builds.

By default CMake sets O3 for Release builds.

Author: denizevrenci

CMakeLists.txt

@@ -82,7 +82,6 @@ find_package(Threads)
 
 if(UNIX)
     add_compile_options(-Wall -Wpedantic -Wextra -Wno-unused-parameter)
-    set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Ofast")
 endif()
 
 if(APPLE)