Fixed compiling for MacOS X

[dmikis]

• removed -lrt from LDFLAGS - seemed to be redundant;
• added opportunity to pass CFLAGS and LDFLAGS from environment.

PS. With -Wextra gcc reports about some unused vars and incorrect comparisons.

[a-nikolaev]

Thanks! -lrt is needed for AIO on Linux, and it does not compile without it. But it's a good reason to get rid of AIO! And replace it with simple non-blocking input, then -lrt can be removed. I will merge the other changes. It was very helpful!

[a-nikolaev]

Hi! I removed AIO and -lrt. So, probably it must be MacOSX-friendly now. If you can test it, please let me know.

[dmikis]

Now ok.

PS. SDL version is super cool :)

[Sicness]

Kirill, let's join to us to the developing process :) https://groups.google.com/forum/#!forum/curseofwar-dev

[a-nikolaev]

Thanks, it's good to know that it works on Mac too! )