[PATCH] Update build procedure in setup README

[Dave Korn]

    Hi gang,

setup/ChangeLog:

	* README: Updated configure options with precise GCC version to use,
	and add CC_FOR_BUILD (needed by libgpg-error).

  Makes sense to everyone?  (CC_FOR_BUILD defaults to just 'cc' if you don't
set it; it's utterly non-critical which version of GCC is used, however, so I
didn't bother to add a version suffix to that one.)

    cheers,
      DaveK
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