"Intel legacy mode" was a special mode to workaround various Intel OpenGL driver limitations during the earlier years of Cemu. It's been unmaintained for years and no longer serves a purpose.
If we ever bring back compatibility with ancient Intel GPUs it should be done in a more structured way than a blunt yes/no flag.
Removes the -DPUBLIC_RELEASE flag. Cemu's debug asserts are now only enabled if the build configuration is Debug. Similarly, on Windows the console is only shown for Debug builds.