octave/linear-algebra: fix numerous small issues

octave/linear-algebra: switch to pkgs.fetchurl

This prevents a download during the evaluation of a package (Time when
the .drv is generated), and delays it to the build time of the
package.

Also, this is the required default in nixpkgs.

octave/linear-algebra: fix meta.licenses -> meta.license

pkgs/development/octave-modules/linear-algebra/default.nix

@@ -8,14 +8,15 @@ buildOctaveLibrary rec {
   pname = "linear-algebra";
   version = "2.2.3";
 
-  src = builtins.fetchurl {
+  src = fetchurl {
     url = "https://octave.sourceforge.io/download.php?package=${pname}-${version}.tar.gz";
     sha256 = "1wwjpxp9vjc6lszh0z3kgy4hyzpib8rvvh6b74ijh9qk9r9nmvjk";
   };
 
   meta = with stdenv.lib; {
     homepage = "https://octave.sourceforge.io/${pname}/index.html";
-    licenses = with licenses; [ gpl3Plus lgpl3Plus bsd ];
+    license = with licenses; [ gpl3Plus lgpl3Plus ];
+    # They claim to have a FreeBSD license, but none of their code seems to have it.
     maintainers = with maintainers; [ KarlJoad ];
     description = "Additional linear algebra code, including matrix functions";
   };