wxwidgets: add wxWindows license

all wx{GTK,widgets,windows,mac,etc}* packages use the wxWindows license.

lib/licenses.nix

@@ -531,6 +531,11 @@ lib.mapAttrs (n: v: v // { shortName = n; }) rec {
     fullName = "Do What The F*ck You Want To Public License";
   };
 
+  wxWindows = spdx {
+    spdxId = "WXwindows";
+    fullName = "wxWindows Library Licence, Version 3.1";
+  };
+
   zlib = spdx {
     spdxId = "Zlib";
     fullName = "zlib License";

pkgs/development/libraries/wxwidgets/2.8/default.nix

@@ -66,5 +66,6 @@ stdenv.mkDerivation rec {
 
   meta = {
     platforms = stdenv.lib.platforms.linux;
+    license = licenses.wxWindows;
   };
 }

pkgs/development/libraries/wxwidgets/2.9/default.nix

@@ -67,6 +67,7 @@ stdenv.mkDerivation {
   enableParallelBuilding = true;
   
   meta = {
-    platforms = with stdenv.lib.platforms; darwin ++ linux;
+    platforms = with platforms; darwin ++ linux;
+    license = licenses.wxWindows;
   };
 }

pkgs/development/libraries/wxwidgets/3.0/default.nix

@@ -78,6 +78,7 @@ stdenv.mkDerivation {
   enableParallelBuilding = true;
   
   meta = {
-    platforms = with stdenv.lib.platforms; darwin ++ linux;
+    platforms = with platforms; darwin ++ linux;
+    license = licenses.wxWindows;
   };
 }

pkgs/development/libraries/wxwidgets/3.0/mac.nix

@@ -100,6 +100,7 @@ stdenv.mkDerivation rec {
 
   meta = {
     platforms = platforms.darwin;
+    license = licenses.wxWindows;
     maintainers = [ maintainers.lnl7 ];
   };
 }