seq: bigdecimal 0.4.0 always needs recompiling

[Nahor]

bigdecimal-rs 0.4.0 (and to a lesser extend 0.4.1 according to their bug report) always needs recompiling on some (all?) systems.
Upgrading to 0.4.3 fixes it for me.

(bigdecimal-rs bug report: akubera/bigdecimal-rs#105)

[cakebaker]

I upgraded it to 0.4.2 in #6285 because upgrading to 0.4.3 breaks a lot of the seq tests. And fixing them doesn't make much sense, as the author of bigdecimal intends to revert some of the changes made in 0.4.3 in the next version.

I hope this still helps.