Fix some meta

pkgs/development/libraries/c-ares/default.nix

@@ -8,13 +8,11 @@ stdenv.mkDerivation rec {
     sha256 = "1nyka87yf2jfd0y6sspll0yxwb8zi7kyvajrdbjmh4axc5s1cw1x";
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     description = "A C library for asynchronous DNS requests";
-
     homepage = http://c-ares.haxx.se;
-
-    license = stdenv.lib.licenses.mit;
-
-    maintainers = [ stdenv.lib.maintainers.shlevy ];
+    license = licenses.mit;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ shlevy ];
   };
 }

pkgs/development/libraries/jansson/default.nix

@@ -8,9 +8,11 @@ stdenv.mkDerivation rec {
     sha256 = "1mvq9p85khsl818i4vbszyfab0fd45mdrwrxjkzw05mk1xcyc1br";
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = "http://www.digip.org/jansson/";
     description = "C library for encoding, decoding and manipulating JSON data";
-    license = stdenv.lib.licenses.mit;
+    license = licenses.mit;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ wkennington ];
   };
 }

pkgs/development/libraries/zlib/default.nix

@@ -48,6 +48,7 @@ stdenv.mkDerivation (rec {
   meta = with stdenv.lib; {
     description = "Lossless data-compression library";
     license = licenses.zlib;
+    platforms = platforms.all;
   };
 } // (if stdenv.isDarwin then {
   postInstall = ''