sysutils/fusefs-encfs: Unbreak build with llvm13

/wrkdirs/usr/ports/sysutils/fusefs-encfs/work/encfs-1.9.5/encfs/NullCipher.cpp:81:36: error: no matching constructor for initialization of 'std::shared_ptr<AbstractCipherKey>'
std::shared_ptr<AbstractCipherKey> gNullKey(new NullKey(), NullDestructor());
                                   ^        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Solution was taken from eacf34a

(cherry picked from commit 7508209)

sysutils/fusefs-encfs/files/patch-encfs_NullCipher.cpp

@@ -0,0 +1,11 @@
+--- encfs/NullCipher.cpp.orig	2022-05-14 16:04:54 UTC
++++ encfs/NullCipher.cpp
+@@ -76,7 +76,7 @@ class NullDestructor {
+   NullDestructor &operator=(const NullDestructor &) = delete; // copy assignment
+   NullDestructor& operator=(NullDestructor&& other) = delete; // move assignment
+
+-  void operator()(NullKey *&) {}
++  void operator()(NullKey *) {}
+ };
+ std::shared_ptr<AbstractCipherKey> gNullKey(new NullKey(), NullDestructor());
+