uru4000: Use OpenSSL to perform AES-ECB encryption

Drop usage of NSS library now that openssl >= 3.0 has not anymore any
license incompatibility.

OpenSSL will provide us a better ground for further developments and
it's also the preferred crypto library by most distros these days

.gitlab-ci.yml

@@ -43,7 +43,7 @@ image: $FEDORA_IMAGE
 
 .build_one_driver_template: &build_one_driver
   script:
-    # Build with a driver that doesn't need imaging, or nss
+    # Build with a driver that doesn't need imaging, or openssl
     - meson setup _build --werror -Ddrivers=$driver
     - meson compile -C _build
     - rm -rf _build/