message: Add note about required dependencies for building OpenSSL on Windows
diff: @@ -50,6 +50,8 @@ submodules are optional or may also be satisfied by system libraries.
  * libssh2 (needed by `libgit2` for SSH support)
  * openssl (needed by `libssh2` and `libgit2` on some platforms)
  +Note that building `OpenSSL` on Windows requires `Perl` and `NASM`.
  +
  How to Build
  ------------
  