1) Fix some casting working in X64 building

2) Use SetMem/CopyMem function to do structure initialization to avoid X64 compiler call standard C library.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@5180 6f19259b-4bc3-4df7-8a09-765794883524

DuetPkg/FSVariable/FSVariable.c

@@ -1165,7 +1165,11 @@ Returns:
     return Status;
   }
   
-  VariableStoreEntry = FlashMapEntryData->Entries[0];
+  CopyMem(
+    (VOID*)&VariableStoreEntry,
+    (VOID*)&FlashMapEntryData->Entries[0],
+    sizeof(EFI_FLASH_SUBAREA_ENTRY)
+    );
 
   //
   // Mark the variable storage region of the FLASH as RUNTIME