cmd: Add support for Ctrl-Z and Ctrl-D in CMD 'more'

[Hugh McMaster]

This patch adds support for Ctrl-Z and Ctrl-D interrupts in CMD's 'more' command (when not invoked via a pipe).

E.g.: C:\> more

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 programs/cmd/builtins.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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