Outdated Informix reference urls

[jbafford]

The two urls below (both used in reference/pdo_informix/reference.xml for https://www.php.net/manual/en/ref.pdo-informix.php and https://www.php.net/manual/en/ref.pdo-informix.connection.php) are both currently redirecting to https://www.ibm.com/support/pages/publications-ibm-informix-dynamic-server-10-family-products. Someone who is more familiar with Informix should figure out updated links for the intended content.

<!ENTITY url.informix.connectionstring "http://publib.boulder.ibm.com/infocenter/idshelp/v10/topic/com.ibm.odbc.doc/odbc66.htm#sii02998361">
<!ENTITY url.informix.dsn "http://publib.boulder.ibm.com/infocenter/idshelp/v10/index.jsp">

[cmb69]

Someone who is more familiar with Informix should figure out updated links for the intended content.

Yeah, that is likely a problem.

[cmb69]

The link in the description of the PECL package is also out-dated.