[sr #110448] AC_CONFIG_AUX_DIRS fails with Windows paths

Update of sr#110448 (group autoconf):

                Priority:       5 - Unprioritized => 1 - Blocked            
                Severity:              3 - Normal => 2 - Minor              
                  Status:                    None => Need Info              

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Follow-up Comment #1:

We made $ac_aux_dir_candidates a $PATH_SEPARATOR separated list because it
could potentially reference the build directory, whose name is allowed to
contain whitespace (see automake/m4/sanity.m4).  It'd be a little weird but
it's not out of the question.

I'm not opposed to changing it back to a whitespace-separated list but first I
need to understand why you have PATH_SEPARATOR=: on a Windows-based system. It
should always be ; on systems that use drive letters, precisely because drive
letters are set off from the rest of the path with a colon.  Maybe the real
bug here is that _AS_PATH_SEPARATOR_PREPARE isn't giving the right answer.


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