Accept FS#9579 by Bartosz Fabianowski, fixing make zip when your build dir is not inside the source tree

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19223 a1c6a512-1295-4272-9138-f99709370657
diff --git a/docs/CREDITS b/docs/CREDITS
index 128bdf6..74d4289 100644
--- a/docs/CREDITS
+++ b/docs/CREDITS
@@ -432,6 +432,8 @@
 Le Jin
 Alex Bennee
 Stéphane Quertinmont
+Bartosz Fabianowski
+
 
 The libmad team
 The wavpack team