The last time configure was run, it was run on a system that
did not enable -std=gnu11 by default, which meant that the
restrict qualifier would not be recognized on certain platforms.
This regenerates the configure files from running bootstrap.sh,
so that these should be recognized on all supported platforms.

Resolves: #586
(cherry picked from commit d0d09ef0103a76d8f66e5013a9e41c05c33c599d)