z/OS: change to available CipherSpecs
Two more CipherSpecs are available on z/OS®.
The following CipherSpecs, previously available only on distributed platforms, are
now also available on z/OS:
ECDHE_RSA_AES_128_GCM_SHA256
ECDHE_RSA_AES_256_GCM_SHA384
This change was made under APAR PI97499.
For more information on platform availability for CipherSpecs, see Enabling CipherSpecs.