Log Message:
xerces-c: update to 3.2.4.

Bug

    [XERCESC-2195] - Invalid attribute in .gitattributes file
    [XERCESC-2196] - cross-compiling issue
    [XERCESC-2214] - Wrong delete[] in MemBufInputSource dtor
    [XERCESC-2217] - ICUTranscoder::transcodeFrom buffer overflow
    [XERCESC-2218] - CurlURLInputStream constructor memory leak
    [XERCESC-2219] - XMLReader constructor: memory leak when refreshRawBuffer() \ 
throws
    [XERCESC-2221] - InMemMsgLoader::loadMsg(): fix memory leak when transcoding \ 
fails
    [XERCESC-2222] - DFAContentModel::checkUniqueParticleAttribution(): fix \ 
memory leak
    [XERCESC-2223] - SAX2XMLReaderImpl::error(): potential memory leak
    [XERCESC-2225] - Link to installed CMake targets of CURL
    [XERCESC-2227] - Memleak fixes in ContentSpecNode and ComplexTypeInfo classes
    [XERCESC-2228] - DFAContentModel: fix memory leaks when OutOfMemoryException \ 
occurs
    [XERCESC-2229] - IGXMLScanner::scanDocTypeDecl(): fix memory leak on exception
    [XERCESC-2230] - DFAContentModel::buildSyntaxTree(): fix memory leaks when \ 
OutOfMemoryException occurs
    [XERCESC-2235] - DFAContentModel::buildDFA(): correctly zero-initialize \ 
fFollowList
    [XERCESC-2236] - Dependencies aren't loaded when using provided CMake config \ 
package
    [XERCESC-2241] - Integer overflows in DFAContentModel class
    [XERCESC-2242] - Non-default curl location breaks autoconf link detection

Improvement

    [XERCESC-2224] - DFAContentModel::checkUniqueParticleAttribution (): speed \ 
enhancement
    [XERCESC-2226] - Increment minimum CMake version to 3.12

Task

    [XERCESC-2200] - Update AppVeyor image in use