[patch] Run-time external data access

[Jules Bergmann]

Add missing block_layout function.

Fix several hard-coded dimensions in rt_extdata.hpp (thanks Stefan)

Use block's dimension as default dimension for Rt_ext_data (thanks Stefan!)

Patch applied.

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