Remove march/mtune flags and provide LTO measurements

Co-authored-by: DL6ER <[email protected]>

Author: Copilot

src/CMakeLists.txt

@@ -216,7 +216,7 @@ endif()
 set(CMAKE_C_FLAGS "-std=c99 -pipe ${WARN_FLAGS} -D_FILE_OFFSET_BITS=64 ${HARDENING_FLAGS} ${DEBUG_FLAGS} ${CMAKE_C_FLAGS} -DHAVE_POLL_H ${SQLITE_DEFINES}")
 
 set(CMAKE_C_FLAGS_DEBUG "-O0 -g3")
-set(CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG -march=native -mtune=native -funroll-loops -flto")
+set(CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG -funroll-loops -flto")
 set(CMAKE_C_FLAGS_RELWITHDEBINFO "${CMAKE_C_FLAGS_RELEASE} -g3")
 set(CMAKE_C_FLAGS_MINSIZEREL "-Os -DNDEBUG -flto")