configure script lies about where it's looking for ssl.h

[wimglenn]

I was trying to use the --with-openssl option and saw:

checking for openssl/ssl.h in /path/to/openssl-1.1.1g/include... no

But that's exactly where it was, file existing at /path/to/openssl-1.1.1g/include/openssl/ssl.h

I had to look in the configure file and see that it was actually tacking on include itself, so you don't need to specify that.

• PR: gh-99279