cmd/more: Add support for Ctrl-Z (and Ctrl-D)

[Hugh McMaster]

Currently it is impossible to exit from the 'more' command in wineconsole/cmd. Running the 'more' command without arguments leaves the user stuck having to press Ctrl-C, which unexpectedly ends the console session. On Windows, users can exit this command by pressing Ctrl-Z.

This patch adds support for Ctrl-Z. It also adds support for Ctrl-D, for those Linux users who may forget to use Ctrl-Z.
 		 	   		  
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