- LIBXML2_SUPPORT is defined if LibXml2 is found
- DOMDOC_SUPPORT  is defined if msxml is found
- XML_SUPPORT is defined if either of them are found

NOXML2 was removed

modified:
  storage/connect/CMakeLists.txt
  storage/connect/global.h
  storage/connect/ha_connect.cc
  storage/connect/plgdbutl.cpp
  storage/connect/plgxml.cpp