some manual deduplication

CREDITS

@@ -226,9 +226,6 @@ E: david.romano+p6i@gmail.com
 N: David Warring
 E: david.warring@gmail.com
 
-N: diakopter
-E: diakopter@gmail.com
-
 N: Dino Morelli
 D: PGE tests
 E: dmorelli@reactorweb.net
@@ -292,9 +289,6 @@ N: Geoff Broadwell
 U: japhb
 E: geoff@broadwell.org
 
-N: Geoffrey Broadwell
-E: gjb@google.com
-
 N: Gerd Pokorra
 E: pokorra@uni-siegen.de
 
@@ -365,9 +359,6 @@ N: Jeff Horwitz
 E: jeff@smashing.org
 U: jhorwitz
 
-N: Jeffrey Goff
-E: jgoff@cpan.org
-
 N: Jens Rehsack
 E: sno@netbsd.org