message: Update compiler selection for mingw
diff: @@ -49,9 +49,12 @@ AC_PROG_CXX
  dnl By default, libtool for mingw refuses to link static libs into a dll for
  dnl fear of mixing pic/non-pic objects, and import/export complications. Since
  dnl we have those under control, re-enable that functionality.
  +dnl Compiler with posix support is needed for cross compile some of c++ 11 features for mingw like threads and mutexes.
  case $host in
  *mingw*)
  lt_cv_deplibs_check_method="pass_all"
  + CC="$CC-posix"
  + CXX="$CXX-posix"
  ;;
  esac
  dnl Require C++11 compiler (no GNU extensions)
  