List NCSA license properly

lib/licenses.nix

@@ -215,6 +215,11 @@ rec {
     url       = "http://research.microsoft.com/en-us/projects/pex/msr-la.txt";
   };
 
+  ncsa = spdx {
+    shortName = "NCSA";
+    fullName  = "University of Illinois/NCSA Open Source License";
+  };
+
   ofl = spdx {
     shortName = "OFL-1.1";
     fullName = "SIL Open Font License 1.1";

pkgs/development/compilers/emscripten/default.nix

@@ -35,6 +35,6 @@ stdenv.mkDerivation rec {
     homepage = https://github.com/kripken/emscripten;
     description = "An LLVM-to-JavaScript Compiler";
     maintainers = with maintainers; [ bosu ];
-    license = "MIT and University of Illinois/NCSA Open Source License";
+    license = with licenses; ncsa;
   };
 }