build error on HEAD (set_tty_color_mode: undefined symbol)

[dhruva]

Hi,
 The xdisp.c code has a call to set_tty_color_mode function that is
not compiled on Windoze (WINDOWSNT) in term.c. Either it should be
compiled or the call needs to be in a guard (#ifndef WINDOWSNT). Since
I do not know which is correct, I am just reporting it.

-dhruva

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