cacert: remove dependency on LWP

The `mk-ca-bundle.pl` script manages quite well using only curl but
fails without LWP being present due to a `use` statement. This removes
the Perl import of the LWP library and adds curl as a build input.

pkgs/data/misc/cacert/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, nss, curl, perl, perlPackages }:
+{ stdenv, nss, curl, perl }:
 
 stdenv.mkDerivation rec {
   name = "nss-cacert-${nss.version}";
@@ -7,9 +7,16 @@ stdenv.mkDerivation rec {
 
   postPatch = ''
     unpackFile ${curl.src};
+
+    # Remove dependency on LWP, curl is enough. Also, since curl here
+    # is working on a local file it will not actually get a 200 OK, so
+    # remove that expectation.
+    substituteInPlace curl-*/lib/mk-ca-bundle.pl \
+      --replace 'use LWP::UserAgent;' "" \
+      --replace ' && $out[0] == 200' ""
   '';
 
-  nativeBuildInputs = [ perl perlPackages.LWP ];
+  nativeBuildInputs = [ curl perl ];
 
   buildPhase = ''
     perl curl-*/lib/mk-ca-bundle.pl -d "file://$(pwd)/nss/lib/ckfw/builtins/certdata.txt" ca-bundle.crt