Support OS X

[kpamnany]

Use relative addressing in the assembly code. Remove warning in strsplit example. Add clock_gettime() substitute for time_slice1 example. Don't use uname -o for Darwin in the makefiles. Tested on OS X 10.11.5/Core i7-4770HQ (x86_64) and for regressions on CentOS 7.1/Xeon E5-2699 v4 (x86_64).

I'd prefer to change the makefiles differently (don't use -o at all, instead use -a and findstring to parse the system name) but this is a more minimal change.

Edit: closes #9.

[kpamnany]

Also tested on Arch Linux/Celeron 2955U (i686). Edit: sorry, it's an x86_64 platform. I have no access to any i686 machines to test.

[sharow]

Thanks!! 🍺

I have tested on

• ✅ FreeBSD x86_64 (amd64)
• ✅ ArchLinux x86_64/i686
• ✅ ArchLinuxARM armv7l/armv6l
• ✅ OS X 10.11.5 x86_64

I'd prefer to change the makefiles differently (don't use -o at all, instead use -a and findstring to parse the system name) but this is a more minimal change.

what if hostname is CharlesDarwin or ... ok this seems to be rare case anyway :)