fix building on 10.6.8

[rpinz]

added APPLE_CC to IS_APPLE test

[aquynh]

merged, thanks!

[aquynh]

oops, this breaks OS X 10.10.5. i think the way you are combining "-e" with "grep" is not right/supported.

$ ./make.sh
....
ld: unknown option: -soname
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [libcapstone.so] Error 1

[fay59]

The problem that I see is that recent OS Xes define both __apple_build_version__ and __APPLE_CC__, so the command returns 2 instead of 1. The fix is probably to check that $(IS_APPLE) is non-zero instead of exactly one.

Would you (@rpinz) mind fixing it?

[rpinz]

Sure, commit incoming. Will always return boolean result if either is found.

#572