Building a 0.76b1 compatible binary

[Tobi]

R1CH: basically I just copied the options from streflop; I've never actually tested which ones (if any) are actually necessary to keep sync.

IMHO it would be nice to clean up the mess; so feel free to remove an option and test whether you keep sync vs official build, then we know it's a redundant option and it can be removed.

(f.ex. -fsingle-precision-constant should be redundant because I once converted all constants from e.g. 1.23 to 1.23f (using sed), but I have never bothered to tested without the option.)