chore(ci): adding back -march=native and -flto

Signed-off-by: Raphael Defosseux <raphael.defosseux@openairinterface.org>

CMakeLists.txt

@@ -47,6 +47,10 @@ if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
     set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS "Debug" "Release")
 endif()
 
+if(CMAKE_BUILD_TYPE STREQUAL "Release")
+   add_compile_options("-march=native;-flto")
+endif()
+
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