Bug #18382225 MYSQL_CONFIG CAN'T HANDLE RELOCABLE PACKAGES THAT USES "LIB64" OR "-64" SUFFIX
  
'lib' is hardcoded into mysql_config, so 'cmake -DINSTALL_LIBDIR=lib64' will not work.
Use INSTALL_LIBDIR when generating mysql_config.
  
mysql_config may be renamed to e.g. mysql_config-32, fix the basedir pattern matching.