[patch] Guard optimized includes

[Jules Bergmann]

Adds a check to the optimized headers to make sure they're not 
accidentally included in the reference impl.

This identified three headers that need to be moved from opt to core:
  - proxy_local_block
  - view_cast
  - us_block

I'll move those shortly.

With this patch:
  - all expected tests pass for optimized library (using IPP/MKL)
  - all expected ref-impl tests pass for ref-impl library

Patch applied.

-- 
Jules Bergmann
CodeSourcery
jules at codesourcery.com
(650) 331-3385 x705
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