Description:
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PHP 7.4.0RC6 does not appear to respect `--with-openssl=[DIR]` at compile time.

I run an Ubuntu server with PHP 7.2.24, PHP 7.3.11 and PHP 7.4.0RC6, primarily alongside Nginx via PHP-FPM. I compile PHP from source, and I bake in the latest OpenSSL (1.1.1d at the time of writing) among other things.

PHP 7.2 and 7.3 respects `--with-openssl=[DIR]` at compile time, but PHP 7.4,0RC6 does not. PHP 7.4.0RC6 uses the system-native version (1.1.1 at the time of writing).

Test script:
---------------
PHP 7.2 compile flags (working as expected):

https://gist.github.com/petecooper/3bcf1da07f54abdca285491e3b27330f

PHP 7.3 compile flags (working as expected):

https://gist.github.com/petecooper/17e7a19d0c9fd8c0442cce1e96e2d113

PHP 7.4.0RC6 compile flags (reverts to system-native OpenSSL):

https://gist.github.com/petecooper/7a0356402028f32073d17d1949191790

Headline details from `php -i` on PHP 7.2, PHP 7.3 and PHP 7.4.0RC6:

https://gist.github.com/petecooper/a115319bf010cedfe8e4b0128ac95212

OpenSSL details from `php -i` on PHP 7.2, PHP 7.3 and PHP 7.4.0RC6:

https://gist.github.com/petecooper/cb655cdae51884f8ebf74a679f79376d

Expected result:
----------------
I expect `--with-openssl=[DIR]` to respect the known-good OpenSSL library at the [DIR] location.