set test prereqs (Emacs, GDB, GPG) v4

[Ali Polatel]

On Tue, Nov 01, 2011 at 08:49:10PM +0100, Pieter Praet wrote:
>Rebased to current master.
>
>Previous version:
>  id:"1307016220-17509-1-git-send-email-pieter at praet.org"
>
>Discussion:
>  id:"1317660447-27520-1-git-send-email-schnouki at schnouki.net"
>

Thanks for the nice work!
I want to share one thing which came up to my mind during reading
through them. Since we require bash for tests, we might go for using
bash's builtin 'type -P foo' instead of 'which foo'. Not that it's
important, just wondered "why not?"

		-alip
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