Revert "CELIX-237: travis: remove default ffi-installation for osx, enable RSA_DI"
Revert "CELIX-237: travis: remove default ffi-installation for osx, enable RSA_DI"

This reverts commit 485c43a7e8c90d49dc9e1a11deb5f20ccf74f2c5.

apache/celix,apache/celix,apache/celix,apache/celix,apache/celix,apache/celix