[vsipl++] [patch] Fix MPI configuration - probe by default

[Stefan Seefeld]

Jules Bergmann wrote:

> +enable_mpi=probe
>  AC_ARG_ENABLE([mpi],
>    AS_HELP_STRING([--disable-mpi],
>                   [don't use MPI (default is to use it if found)]),,
>    [enable_mpi=no])

The above doesn't quite work, as the 'enable_mpi' variable is used by the
AC_ARG_ENABLE macro internally, so presetting it will confuse configure.
The result is that MPI is always probed, and the buildbot's serial
builds fail.
The attached patch fixes this. Committed.

Regards,
		Stefan

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