PHPC-1100: Require SSL or crypto as needed in tests

[jmikola]

https://jira.mongodb.org/browse/PHPC-1100

This addresses test failures when the driver is compiled without SSL.

Tested with ./configure --with-mongodb-ssl=no.

Note that unrecognized values (e.g. --with-mongodb-ssl=whatever) functions similarly to no:

checking whether to enable crypto and TLS... whatever
checking deprecated option for OpenSSL library path... auto
checking for pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.9.0... yes
checking which TLS library to use... whatever
checking whether to use system crypto profile... no
checking deprecated option for whether to use system crypto profile... no

This skips all of the AS_IF branches in CheckSSL.m4 and simply hits the following:

AC_MSG_CHECKING([which TLS library to use])
AC_MSG_RESULT([$PHP_MONGODB_SSL])

[derickr]

LGTM