Revert all the #pramga(1) related patches to r6434, we need to review all the updates carefully.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6461 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Include/IndustryStandard/Mbr.h

@@ -27,9 +27,10 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #define MBR_SIZE                    512
 
-///
-/// MBR Partition Entry
-///
+#pragma pack(1)
+//
+// MBR Partition Entry
+//
 typedef struct {
   UINT8 BootIndicator;
   UINT8 StartHead;
@@ -54,4 +55,6 @@ typedef struct {
   UINT16                Signature;
 } MASTER_BOOT_RECORD;
 
+#pragma pack()
+
 #endif