util/shell.nix: Add libjaylink

libjaylink is packaged since NixOS 21.11 and it is out for many months
now. Thus, include the package libjaylink and remove comments.

Signed-off-by: Felix Singer <felixsinger@posteo.net>
Change-Id: I56e750831143a4e34be95ec111a37bb476abfe85
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/64352
Original-Reviewed-by: Thomas Heijligen <src@posteo.de>
Original-Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/73400
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/util/shell.nix b/util/shell.nix
index 6840383..2e7094a 100644
--- a/util/shell.nix
+++ b/util/shell.nix
@@ -5,7 +5,7 @@
 
 	buildInputs = [
 		libftdi1
-#		libjaylink	# Will be added in NixOS 21.11
+		libjaylink
 		libusb1
 		meson
 		ninja