[patch] configure fixes

[Jules Bergmann]

This patch updates configure to
  - probe for exception support by the compiler (ccmc/ghs does not
    enable exceptions by default)
  - disable the builtin ATLAS when cross compiling (falling back to
    the simple CLAPACK/CBLAS instead).

Patch applied to branches/1.3 and trunk.

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