[PATCH 0 of 7] Update some tools and add support for gcc and binutils snapshots

[Bryan Hundven]

* Update libtool to 2.2.10
* Update m4 to 1.4.15
* Update gcc URLs. Gcc no longer has inconsistent download structure.
* Add support for downloading and building gcc snapshots.
* Add support for gcc's new 'install-strip' target, if strip is enabled and we have CC_GCC_4_6_or_later.
* Update binutils URLs.
* Add support for downloading and building binutils snapshots. (still don't do the daily/weekly snapshot)


Let me know if you have any problems, questions, or comments.

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