I set it to trivial because I didn't notice any errors, but if bzflag needs c-ares and curl .. I suppose it also needs curl with c-ares support (or at least it can benefit from it). So, I've got a patch that may be applied to both 2.0.8 and 2.0.10 The style is from the gimp-9999 ebuild, I don't know if it's a standard, I've just reused it.
Created attachment 137356 [details, diff] This adds the request to build curl with c-ares support. I've made two patches, but they showed to be identical for 2.0.8 and 2.0.10 so, if I'm right with this problem, you can apply them to both ebuilds. :)
Fix done on 2.0.10. Thanks