oneapi_2023: fix parsing of new apt package list

pkgs/intel-oneapi/2023.nix

@@ -47,7 +47,8 @@ let
     installPhase = ''
       awk -F': ' '\
         BEGIN   { print "[ {" } \
-        NR>1 && /^Package: / { print "} {"; } \
+        NF==0 { empty=1; } \
+        NF && empty { print "} {"; empty=0; } \
         /: /    { printf "%s = \"%s\";\n", $1, $2 } \
         END     { print "} ]" }' $srcs > $out
     '';