release-small.nix: Fix evaluation error

Changed files
+2 -1
pkgs
top-level
+2 -1
pkgs/top-level/release-small.nix
···
mpg321 = linux;
mutt = linux;
mysql = linux;
-
netcat = all;
+
# netcat broken on darwin
+
netcat = linux;
nfs-utils = linux;
nix = all;
nixUnstable = all;