octave.pkgs.signal: init at 1.4.1

As of this commit, this matches the output that OpenSuSe's zypper
produces when installing the octave-forge-signal package.

pkgs/development/octave-modules/signal/default.nix

@@ -0,0 +1,26 @@
+{ buildOctavePackage
+, lib
+, fetchurl
+, control
+}:
+
+buildOctavePackage rec {
+  pname = "signal";
+  version = "1.4.1";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/octave/${pname}-${version}.tar.gz";
+    sha256 = "1amfh7ifjqxz2kr34hgq2mq8ygmd5j3cjdk1k2dk6qcgic7n0y6r";
+  };
+
+  requiredOctavePackages = [
+    control
+  ];
+
+  meta = with lib; {
+    homepage = "https://octave.sourceforge.io/signal/index.html";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ KarlJoad ];
+    description = "Signal processing tools, including filtering, windowing and display functions";
+  };
+}