Status of OpenSSL dependency

[bkuhls]

This commit removed the functionality to build sofia-sip without OpenSSL as seen by the buildroot autobuilders:

	 LTCOMPILE tport.lo

In file included from tport_ws.h:43,

                 from tport.c:83:

ws.h:28:10: fatal error: openssl/ssl.h: No such file or directory

   28 | #include <openssl/ssl.h>

If OpenSSL has become a mandatory dependency what about the removing the configure option --with-openssl in https://github.com/freeswitch/sofia-sip/blob/v1.13.18/m4/sac-openssl.m4 ?

Originally posted by @bkuhls in 8081a1a