Re #1765: 
 - Fixed unnecessary white-space error
 - Limiting log message to servers
 - Adding SSL_OP_SINGLE_ECDH_USE optionally
 - OpenSSL could be built without elliptic curve support, or too old



git-svn-id: http://svn.pjsip.org/repos/pjproject@4871 74dad513-b988-da41-8d7b-12977e46ad98