make: split sed commands into separate lines

The space before / in sed address range is necessary to avoid it being
interpreted as the root directory on Windows cmd.exe:

c:\Programme\unxutils\bin\sed.exe: -e expression #3, char 1: Unknown command: `C'
Color Depth demo: extend regex to work properly on Windows

\r does not work on this system for the CRLF line breaks, both with sed from
UnxUtils on cmd.exe or in MinGW Shell.

$ would work here, but didn't work on Linux for the CRLF line breaks, this
regex part seems only to work for native line endings.