php5{2,3,4,5,6}-openssl: use openssl10 or make them compatible with openssl11

[yan12125 (Chih-Hsuan Yen)]

Currently php56-openssl does not build with port:openssl11

/opt/local/var/macports/build/_Users_yen_var_syncthing_Projects_macports-ports_lang_php/php56-openssl/work/php-5.6.40/ext/openssl/openssl.c:1904:15: error: incomplete definition of type 'struct X509_extension_st'
            p = extension->value->data;
                ~~~~~~~~~^

I believe older php*-openssl ports are also incompatible with openssl11. Please make them use openssl10 or patch them to be compatible with openssl11.

This issue blocks migration to OpenSSL 1.1 (1)(2)

(1) ​https://github.com/macports/macports-ports/pull/3822

(2) ticket:52101

[yan12125 (Chih-Hsuan Yen)]

In a240ef818d25a4ecb22f689a2e5a3f1e338bfaa6/macports-ports (master):

php5{2,3,4,5,6}-openssl: use openssl 1.0 via the old_openssl port group

They are not compatible with OpenSSL 1.1. For example, php56-openssl
fails with:

/opt/local/var/macports/build/_Users_yen_var_syncthing_Projects_macports-ports_lang_php/php56-openssl/work/php-5.6.40/ext/openssl.c:1904:15: error: incomplete definition of type 'struct X509_extension_st'

p = extension->value->data;

~

All ports tested with the following PHP script:

<?php
echo file_get_contents('​https://httpbin.org/ip');
?>

Closes: #58464