build: disable plugins which require openssl if openssl is not available

Type: improvement
Change-Id: I4591fcb31dd28d1771b3d6e5afdaa14f29efe6ef
Signed-off-by: Damjan Marion <damarion@cisco.com>

src/plugins/wireguard/CMakeLists.txt

@@ -12,7 +12,13 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+if(NOT OPENSSL_FOUND)
+  message(WARNING "OpenSSL not found - wireguard plugin disabled")
+  return()
+endif()
+
 if (OPENSSL_VERSION VERSION_LESS 1.1.0)
+  message(WARNING "OpenSSL too old - wireguard plugin disabled")
   return()
 endif()