Fix bogus calls to GetMemoryStatus and GetMemoryStatusEx: need to set the dwLength member of the struct prior to calling. Otherwise it's just a garbage value from the stack. Also, pay attention to return value of GetMemoryStatusEx: if it indicates failure then just return 0 without using any of the other data the call returns.

Source/kwsys/SystemInformation.cxx

@@ -2279,11 +2279,16 @@ int SystemInformationImplementation::QueryMemory()
 #elif _WIN32
 #if  _MSC_VER < 1300
   MEMORYSTATUS ms;
+  ms.dwLength = sizeof(ms);
   GlobalMemoryStatus(&ms);
 #define MEM_VAL(value) dw##value
 #else
   MEMORYSTATUSEX ms;
-  GlobalMemoryStatusEx(&ms);
+  ms.dwLength = sizeof(ms);
+  if (0 == GlobalMemoryStatusEx(&ms))
+  {
+    return 0;
+  }
 #define MEM_VAL(value) ull##value
 #endif
   unsigned long tv = ms.MEM_VAL(TotalVirtual);