Update OS X Requirement to 10.9

[ghost]

Update OS X requirement to 10.9 as per https://code.google.com/p/dolphin-emu/issues/detail?id=7243

[pauldacheez]

Dolphin still runs on 10.7/10.8 fine as long as you have a GL3 GPU. That said, it does have enough issues on 10.7/10.8 that I'd prefer the requirement be upped.

If you're gonna up the requirement, change it in CMakeLists.txt too, please. (If you want to keep the branch as a single commit, do git commit --amend after git add-ing your changes.)

[Fuzzik]

Would it be a good idea to require 10.7+, but maybe add something that says 10.9 is recommended?

[pauldacheez]

Every Mac (that I know of) that can run current Dolphin at all (e.g. meets the GPU requirements) is upgradeable all the way to 10.10 Yosemite, and 10.9 Mavericks had major OpenGL runtime/driver improvements (full GL 3.3 support for all GPUs, full GL 4.1 for newer GPUs). 10.7 Lion has issues with GL support in most cases, and 10.8 Mountain Lion isn't even well-tested enough for me to know of any issues; even if we can technically support 10.7/10.8 on certain GPUs, I'd rather avoid any corner cases and require Mavericks so that it either runs fine or just tells you to upgrade.

[Fuzzik]

Sounds like a good idea.

[ghost]

Okay CMakeLists.txt should be updated now too. Bear with me if I'm doing anything wrong as I'm fairly new to working with GitHub.

[comex]

LGTM
@dolphin-emu-bot rebuild

[comex]

@pringo Build failure - for some reason this PR causes <objc/objc.h> to get included in the same file as SoundTouch. Yay C

[ghost]

Is that a problem I can fix on my end?

[comex]

Do you know C++? If not, I can figure it out...

[ghost]

I do not.