Use common licence attributes from lib/licenses.nix

Many (less easily automatically converted) old-style strings
remain.

Where there was any possible ambiguity about the exact version or
variant intended, nothing was changed. IANAL, nor a search robot.

Use `with stdenv.lib` wherever it makes sense.

pkgs/tools/filesystems/s3fs/default.nix

@@ -9,8 +9,8 @@ stdenv.mkDerivation {
   preConfigure = "./autogen.sh";
   buildInputs = [ autoconf automake pkgconfig curl openssl libxml2 fuse ];
   
-  meta = {
+  meta = with stdenv.lib; {
     description = "Mount an S3 bucket as filesystem through FUSE";
-    license = "GPLv2";
+    license = with licenses; gpl2;
   };
 }