Log Message:
Update to 2.4.3
pkgsrc changes: static -> dynamic
changelog:
## 2.4.3  *Mar 2014*

  * Update behaviour of `newBroadcastTChanIO` to match
    `newBroadcastTChan` in causing an error on a read from the
    broadcast channel

  * Add `mkWeakTVar`

  * Add `isFullTBQueue`

  * Fix `TChan` created via `newBroadcastTChanIO` to throw same
    exception on a `readTChan` as when created via `newBroadcastTChan`

  * Update to Cabal 1.10 format