BUILD: ssl: disable deprecated functions for AWS-LC 1.29.0

BUILD: ssl: disable deprecated functions for AWS-LC 1.29.0

AWS-LC have a lot of functions that does nothing, which are now
deprecated and emits some warning.

This patch disables the following useless functions that emits a warning:
SSL_CTX_get_security_level(), SSL_CTX_set_tmp_dh_callback(),
ERR_load_SSL_strings(), RAND_keep_random_devices_open()

The list of deprecated functions is here:

https://github.com/aws/aws-lc/blob/main/docs/porting/functionality-differences.md