Further SrcDS distribution cleanups * Do not build or ship filesystem_stdio.dll/so (on dedicated servers it is replaced by dedicated.dll/so) * Do not ship stdshader_dbg.so, stdshader_dx9.so (probably unused, runs without em) * Delete prebuilt dedicated.so from the repo (useless) * Remove dxsupport files from dedicated servers * Remove some more .dll files from Windows SrcDS as well