[TASK] Add OpenSSL verification to system environment check

Add OpenSSL verification to system environment check to be able to require
rsa and saltedpassword extensions.

Change-Id: I2eedc03569f93478eac426807f83c348c5788b42
Resolves: #46959
Releases: 6.1
Reviewed-on: https://review.typo3.org/19626
Reviewed-by: Philipp Gampe
Tested-by: Philipp Gampe
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert