[PR] Fix improper check for `mbrlen`/`mblen`, to dea l with the configuration failure for Android below API level 26 [xerces-c]

zjyhjqs opened a new pull request, #56:
URL: https://github.com/apache/xerces-c/pull/56

   (I know this is not a GitHub project. But my application for JIRA account hasn't been replied yet.)
   
   The usage place (`IconvLCPTranscoder::calcRequiredSize`) will check the existence of `::mbrlen` first. If not then use the `::mblen` as alternative.
   
   https://github.com/apache/xerces-c/blob/5fe4f4b5a861fa8acf4bb66d3a2ad3e4396d68ec/src/xercesc/util/Transcoders/Iconv/IconvTransService.cpp#L237-L241
   
   NDK doesn't provide the implementation of `::mblen` below API level 26. Only checks `HAVE_MBLEN` would consequence to configuration failure.


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