New apr_stat/apr_dir_read behavior

With the new Apache 2.2 and APR 1.2, apr_stat and apr_dir_read now
return APR_INCOMPLETE which Subversion doesn't handle very well. At
least, they return it much more often that previous releases did.

This patch gets some things working (I can checkout Subversion and
create a repository), but I'm not sure if it's safe to ignore
APR_INCOMPLETE in all these places. Would someone with more APR
knowledge please take a look?

It looks to me like we need to handle APR_INCOMPLETE almost everywhere
we call apr_stat or apr_dir_read or any other functions that can
return APR_INCOMPLETE.

DJ

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