(ITS#8533) Support OpenSSL-1.1.0c

[sca+openldap@andreasschulze.de]

Full_Name: Andreas Schulze
Version: 2.4.45~git
OS: linux
URL: ftp://ftp.openldap.org/incoming/andreas-schulze-161125.patch
Submission from: (NULL) (2001:a60:f0b4:e502::152)


while http://www.openldap.org/its/index.cgi/Development?id=8353
end with "work with openssl-1.1" I checked out openldap from git in november
2016
and found it does not compile. So I write the patch.

it solve the following challenges:
 - SSL_library_init no longer exist, use OPENSSL_init_ssl to detect openssl
 - configure use pkg-config to find the names of libssl and libcrypto
 - codechanges in libraries/libldap/tls_o.c to handle the API changes introduced
by openssl-1.1.0