Improved x86 SSE build and run-time checks.

Improved x86 SSE build and run-time checks.

Replaces the current build/run-time checks for SSE level in
opts_check_x86.cpp with a simpler and more future-proof version.
Also adds SSE versions 4.1 and 4.2 to the config file.

Author: henrik.smiding@intel.com

Signed-off-by: Henrik Smiding <henrik.smiding@intel.com>
Committed: http://code.google.com/p/skia/source/detail?r=14644

R=reed@google.com, mtklein@google.com, tomhudson@google.com, djsollen@google.com, joakim.landberg@intel.com

Author: henrik.smiding@intel.com

Review URL: https://codereview.chromium.org/272503006

git-svn-id: http://skia.googlecode.com/svn/trunk@14693 2bbb7eff-a529-9590-31e7-b0007b416f81