gtest: Update meta

pkgs/development/libraries/gtest/default.nix

···
     cp -v -r ../src $out
   '';
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "Google test: Google's framework for writing C++ tests.";
     homepage = https://code.google.com/p/googletest/;
-    license = stdenv.lib.licenses.bsd3;
-    maintainers = [ stdenv.lib.maintainers.zoomulator ];
+    license = licenses.bsd3;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ zoomulator ];
   };
 }