Turn off --no-undefined on OpenBSD again. Leave it on everywhere else for now.
Fixed bug 2245 - add SDL_acos and SDL_asin

Sylvain

Here's some code to add arc cosine, and arc sin functions to SDL_stdlib.c
There are plainly written using SDL_atan.

--HG--
extra : rebase_source : 3c92b648c11366af38fac18df85eb7d5da6fe292