remove FIX_GCC_LINKING_PROBLEM and -DDEFINE_CXA_PURE_VIRTUAL
  replace echo in configure.in with AC_MSG_WARN/AC_MSG_ERROR
  don't set -DUSE_MYSYS_NEW for gcc 2.95
  set $USE_MYSYS_NEW even if CXX is g++
  yassl bugfixes
  instantiate all yassl templates explicitly