Remove the Windows GCC driver.
Summary: This patch drops the GCC driver and instead moves the only remaining path that we need to keep for backwards compatibility to the settings file. It also generalizes the code that expands `$TopDir` so it can expand it within any location in the string and also changes it so `$TopDir` is expanded only after the words call because `$TopDir` can contains spaces which would be horribly broken. Test Plan: ./validate Reviewers: austin, hvr, bgamari Reviewed By: bgamari Subscribers: rwbarton, thomie, erikd GHC Trac Issues: #13709 Differential Revision: https://phabricator.haskell.org/D3592
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