Portable sh programming in configure.ac

[Rik]

12/24/12

Michael,

In changeset 15836 you introduced double-quoted backtick expressions with
escaped double quotes (expressions of the form var="`...\"...\"...`"). 
According to the portable sh guidelines from Autoconf (section 11.8
http://www.gnu.org/software/autoconf/manual/autoconf.html#Shell-Substitutions)
this isn't portable.  I switched the expressions to the form
var=`..."..."...` and it works with my version of Bourne sh.  Could you
verify that the attached changeset also works with the MSYS shell?  If it
does then I will commit it.  Otherwise, we can search for a different solution.

--Rik

config.cset
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