Don't need use $(DELIM) in include statement

[Nathan Hartman]

I'm confused about commit edb0ce2d5afa8a0905bd4536ac39eaf1819dfc56:
"build: Don't need use $(DELIM) in include statement"

This changes various lines in Make.defs from this:
    include wireless$(DELIM)spirit$(DELIM)drivers$(DELIM)Make.defs
to this:
    include wireless/spirit/lib/Make.defs

Don't we need $(DELIM) to support builds on Windows?

Thanks,
Nathan