gnuradio.pkgs: init

- Write a `mkDerivation` and `mkDerivationWith` function for gnuradio,
  like qt5.
- qradiolink, gqrx: Use gnuradio's callPackage and mkDerivation.
- Use gnuradio.callPackage to define all gnuradio.pkgs.
- Move all gnuradio packages expressions to pkgs/development/gnuradio-modules/ -
  modeled after Python's.
- Add more paths to gnuradio's wrapper - add the extra packages as
  python modules, and add their executables with proper env vars
  wrapping.

Co-authored-by: Frederik Rietdijk <fridh@fridh.nl>

pkgs/development/gnuradio-modules/mkDerivation.nix

@@ -0,0 +1,23 @@
+{ lib
+, unwrapped
+}:
+
+mkDerivation:
+
+args:
+
+# Check if it's supposed to not get built for the current gnuradio version
+if (builtins.hasAttr "disabledForGRafter" args) &&
+(lib.versionAtLeast unwrapped.versionAttr.major args.disabledForGRafter) then
+let name = args.name or "${args.pname}"; in
+throw "Package ${name} is incompatible with GNURadio ${unwrapped.versionAttr.major}"
+else
+
+let
+  args_ = {
+    enableParallelBuilding = args.enableParallelBuilding or true;
+    nativeBuildInputs = (args.nativeBuildInputs or []);
+    # We add gnuradio itself by default
+    buildInputs = (args.buildInputs or []) ++ [ unwrapped ];
+  };
+in mkDerivation (args // args_)