Fix busted-proxy detection: any 411 will be received without a
Subversion error. Tested by tweaking the testsuite code to set
busted-proxy=yes and running the entire testsuite through nginx;
all tests pass in this configuration. One remaining problem is
that redirect_tests.py 2 and 3 FAIL when busted-proxy is set and
the client connects directly to httpd without a proxy.
* subversion/libsvn_ra_serf/options.c
(svn_ra_serf__probe_proxy): Handle 411 in the SVN_NO_ERROR path.
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