CMakeLists.txt:
  1. add -DSAFEMALLOC -DSAFE_MUTEX in the top-level CMakeLists.txt
     don't force plugins to copy-paste these lines in their CMakeLists.txt
  2.1 search plugin/* for plugins (not only storage/*),
  2.2 recognize MYSQL_PLUGIN (not only MYSQL_STORAGE_ENGINE),
  2.3 extract library names from the plug.in (don't force library names to
      be ha_<engine>.dll and <engine>.lib)
include/mysql/plugin.h:
  define MYSQL_PLUGIN_EXPORT appropriately
  (backport from 5.5)
libmysqld/CMakeLists.txt:
  remove unnecessary workaround
plugin/fulltext/CMakeLists.txt:
  build fulltext example plugin on windows
storage/maria/CMakeLists.txt:
  The library is called libmaria_s.lib, not maria.lib
storage/maria/unittest/CMakeLists.txt:
  The library is called libmaria_s.lib, not maria.lib
storage/myisam/CMakeLists.txt:
  The library is called libmyisam_s.lib, not myisam.lib
storage/mysql_storage_engine.cmake:
  introduce MYSQL_PLUGIN macro.
  don't force library names to be ha_<engine>.dll and <engine>.lib
storage/xtradb/CMakeLists.txt:
  remove a condition from include
win/README:
  don't use deprecated syntax
win/configure-mariadb.sh:
  don't use deprecated syntax
win/configure.js:
  1. support MYSQL_PLUGIN in addition to MYSQL_STORAGE_ENGINE.
  2. support plugin/* in addition to storage/*