Enable Link-Time Optimization (LTO) for the Release build profile

[zamazan4ik]

Hi!

I noticed that in the build scripts Link-Time Optimization (LTO) is not enabled for the Release build profile. I suggest trying to enable it since it can help reduce the binary size and perform better compiler optimizations. In the most basic case, it can be enabled with -flto compiler flag (for Clang/GCC compilers) or via CMAKE_INTERPROCEDURAL_OPTIMIZATION if we want to control it on the CMake level.

Thank you.