Add link to building wiki page

CHANGELOG.md

 ## 1.19.0
 
 ### Core library changes
 
 * `dart:io`
   * `Socket.connect` with source-address argument is now non-blocking
     on Mac. Was already non-blocking on all other platforms.
   * Report a better error when a bind fails because of a bad source address.
 
 ### Strong Mode
@@ skipping 40 matching lines @@
         // Treat `object` as `String` inside this block.
         // But it will require a cast to pass it to something that expects `T`.
         print(object.substring(1));
       }
     }
     ```
 
 ### Dart VM
 
 *   The dependency on BoringSSL has been rolled forward. Going forward, builds
-    of the Dart VM including secure sockets will require a compiler with C11
-    support, and to link against glib 2.16 or newer.
+    of the Dart VM including secure sockets will require a compiler with C++11
+    support, and to link against glib 2.16 or newer. For details, see the
+    [Building wiki page](https://github.com/dart-lang/sdk/wiki/Building).
 
 ### Tool Changes
 
 * `dartfmt` - upgraded to v0.2.9
   * Support trailing commas in argument and parameter lists.
   * Gracefully handle read-only files.
   * About a dozen other bug fixes.
 
 * Pub
   * Added the ability for packages to declare a constraint on the [Flutter][]
@@ skipping 1081 matching lines @@
     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.