open62541: allow overriding encryption providers

Without "encryption" PACKAGECONFIG, the option UA_ENABLE_ENCRYPTION=OFF
is passed, which disables encryption support altogether and makes it
impossible to override the encryption provider. Since no encryption
support is already the default, we don't have to specify anthing to
disable encryption.

Additionally, explicitly specify MbedTLS as the encryption provider;
this is the preferred way to enable any one of the three supported
providers (LibreSSL, OpenSSL or MbedTLS). The current method prints a
deprecation warning:

    CMake Deprecation Warning at CMakeLists.txt:200 (message):
      Set UA_ENABLE_ENCRYPTION to the desired encryption library.

Signed-off-by: Johannes Kauffmann <johanneskauffmann@hotmail.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

0 files changed, 0 insertions, 0 deletions