message: [Build] Add info about '--with-unsupported-ssl'
  Compilation with openssl version more recent than 1.0.1 is not advised but still possible. We need t let self compilers know about that.
diff: @@ -1100,8 +1100,8 @@ CXXFLAGS="${save_CXXFLAGS}"
  AC_CHECK_LIB([crypto],[RAND_egd],[],[
  AC_ARG_WITH([unsupported-ssl],
  [AS_HELP_STRING([--with-unsupported-ssl],[Build with system SSL (default is no; DANGEROUS; NOT SUPPORTED; You should use OpenSSL 1.0)])],
  - [AC_MSG_WARN([Detected unsupported SSL version: This is NOT supported, and may break consensus compatibility!])],
  - [AC_MSG_ERROR([Detected unsupported SSL version: This is NOT supported, and may break consensus compatibility!])]
  + [AC_MSG_WARN([Detected unsupported SSL version: This is NOT supported, and may break consensus compatibility! Use '--with-unsupported-ssl' if you don't care])],
  + [AC_MSG_ERROR([Detected unsupported SSL version: This is NOT supported, and may break consensus compatibility! Use '--with-unsupported-ssl' if you don't care])]
  )
  ])
  