MSVC warning fixes

This was SVN commit r7585.

source/lib/allocators/pool.h

@@ -247,6 +247,10 @@ public:
 	{
 	}
 
+	pool_allocator& operator=(const pool_allocator&) throw ()
+	{
+	}
+
 	pointer address(reference r)
 	{
 		return &r;
@@ -270,6 +274,7 @@ public:
 	void destroy(const pointer ptr)
 	{
 		ptr->~T();
+		UNUSED2(ptr); // silence MSVC warnings
 	}
 
 	pointer allocate(size_type n)

source/lib/precompiled.h

@@ -54,6 +54,7 @@
 # pragma warning(disable:4786)	// identifier truncated to 255 chars
 # pragma warning(disable:4351)	// yes, default init of array entries is desired
 # pragma warning(disable:4355)	// 'this' used in base member initializer list
+# pragma warning(disable:4718)	// recursive call has no side effects, deleting
 // .. disabled only for the precompiled headers
 # pragma warning(disable:4702)	// unreachable code (frequent in STL)
 // .. VS2005 code analysis (very frequent ones)