This prevents `thirdparty/oidn/weights/rtlightmap_hdr.tza` from always being
considered as modified when using an old Git version (such as the one on
Ubuntu 16.04).
text=auto works well in Git 2.10+ but it's broken in previous versions,
which are still used in production on e.g. Ubuntu 16.04 LTS.
Also fix a couple missed text files with CRLF terminators.
.bat files likely require it to be processed properly on Windows,
but core.autocrlf should take care of converting them on the fly
when checking out on Windows.
