tryfix #2416 - lock some guards.

src/mesh/CryptoEngine.cpp

@@ -1,6 +1,8 @@
 #include "CryptoEngine.h"
 #include "configuration.h"
 
+concurrency::Lock *cryptLock;
+
 void CryptoEngine::setKey(const CryptoKey &k)
 {
     LOG_DEBUG("Using AES%d key!\n", k.length * 8);