Refactor: Modernize disallowed copy constructors/assignment

Use C++11's better capability of expressing an interface of a non-copyable class by publicly deleting its copy ctor and assignment operator instead of just declaring them private.

src/streams.h

@@ -455,10 +455,6 @@ public:
 class CAutoFile
 {
 private:
-    // Disallow copies
-    CAutoFile(const CAutoFile&);
-    CAutoFile& operator=(const CAutoFile&);
-
     const int nType;
     const int nVersion;
 
@@ -475,6 +471,10 @@ public:
         fclose();
     }
 
+    // Disallow copies
+    CAutoFile(const CAutoFile&) = delete;
+    CAutoFile& operator=(const CAutoFile&) = delete;
+
     void fclose()
     {
         if (file) {
@@ -564,10 +564,6 @@ public:
 class CBufferedFile
 {
 private:
-    // Disallow copies
-    CBufferedFile(const CBufferedFile&);
-    CBufferedFile& operator=(const CBufferedFile&);
-
     const int nType;
     const int nVersion;
 
@@ -609,6 +605,10 @@ public:
         fclose();
     }
 
+    // Disallow copies
+    CBufferedFile(const CBufferedFile&) = delete;
+    CBufferedFile& operator=(const CBufferedFile&) = delete;
+
     int GetVersion() const { return nVersion; }
     int GetType() const { return nType; }