git-p4: Use P4EDITOR environment variable when set
Perforce allows you to set the P4EDITOR environment variable to your preferred editor for use in perforce. Since we are displaying a perforce changelog to the user we should use it when it is defined. Signed-off-by: NShawn Bohrer <shawn.bohrer@gmail.com> Signed-off-by: NSimon Hausmann <simon@lst.de>
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