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H A Dconfigure825700d34a486eb381bc4e80262ff38a2deaeac0 Tue Dec 05 01:14:18 UTC 2017 Augustin Cavalier <waddlesplash@gmail.com> configure: Rewrite implementation of --update.

Previously --update was kind of a hack, as it just dumped all
the variables from BuildConfig back into ./configure and attempted
to rerun from there.

Instead, now we store all of the variables and environs configure
was invoked with in the top of BuildConfig and re-call it using them.
This is much more robust, as configure will actually recompute
all of the values from the BuildConfig.

As a side effect, if configure was originally invoked to build crosstools,
it would have done so again, so instead add a check to see if they
exist, and skip them if they do. It's easy enough to delete the
directory if you want to force a crosstools rebuild.

Briefly discussed with mmlr on IRC.