OSX 10.10 (and more) use Accelerate Framework instead of veclib

[ixartz]

OSX Yosemite 10.10 (and more) use Accelerate Framework instead of veclib.
In Accelerate Framework, cblas.h does not exist and we need to include Accelerate/Accelerate.h

[lukeyeager]

This belongs in a separate commit, but I can verify that it's needed.

https://travis-ci.org/BVLC/caffe/jobs/88939834
https://travis-ci.org/BVLC/caffe/jobs/89066109
https://travis-ci.org/NVIDIA/caffe/jobs/89073960

[lukeyeager]

Merged in #3276.

[ixartz]

Update the pull request after merging wget cmake with --no-check-certificate

[Duffycola]

This problem has reappeared in OS X El Capitan 10.11.5 (15F34), where vecLib has moved from the standard location into the Accelerate framework.

This commit, however, does not work on the cmake side, because the vecLib.h files still exist:

$ cat /System/Library/Frameworks/vecLib.framework/Headers/vecLib.h
#error "The vecLib framework is deprecated. Please include <Accelerate/Accelerate.h> instead of <vecLib/vecLib.h> and link to the Accelerate framework instead of the vecLib framework."

I think this commit goes in the right direction, but is now a bit outdated. Also the fix should happen in cmake/Modules/FindvecLib.cmake

[shelhamer]

Thanks for the improved OS X build logic @ixartz. I agree with @Duffycola that this could still be an issue due to the deprecated vecLib.h. A further patch along the lines of #4247 (comment) might be needed to make this work correctly.

If anybody on OS X wants to follow-up with a patch for that (potentially simplifying the just-merged #4247), please do.

p.s. FWIW the Makefile build seems to be compatible with El Cap.