added libs variable for ndbmgmclient used by mysqladmin
    add linkage with @ndb_mgmclient_libs@
    additional options for ndbcluster
    added support for managing the cluster to mysqladmin
    added DEFINE_CXA_PURE_VIRTUAL flag to CFLAGS to enable linkage with c++ libs
    use macros for C_MODE_START/END so that define of FIX_GCC_LINKING_PROBLEM works in c-programs