failonerror_test: skip the test with curl-7.75.0+
failonerror_test: skip the test with curl-7.75.0+

libcurl does not provide the reason phrase from HTTP status line
in the error buffer any more:

    https://github.com/curl/curl/issues/6615

Fixes: https://github.com/pycurl/pycurl/issues/679

pycurl/pycurl,pycurl/pycurl,pycurl/pycurl