i#1643 Yosemite support: increase max supported version
i#1643 Yosemite support: increase max supported version

Increases the max MacOSX version we support, and downgrades a violation to
a warning as there's a good chance we'll keep working.

Simple programs are working on Yosemite but there are some false positives
to investigate.

SVN-Revision: 2114

code4bones/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,sigma-random/drmemory,code4bones/drmemory,code4bones/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,LohithBlaze/drmemory,sigma-random/drmemory,LohithBlaze/drmemory,code4bones/drmemory,sigma-random/drmemory,code4bones/drmemory,LohithBlaze/drmemory