The Studio compilers don't have support for a stack of structure packing,
but we don't need full stack support here; just the original switch and
back again.

--- p7zip_9.20.1/C/Ppmd.h.orig	Sat Jan 22 11:32:30 2011
+++ p7zip_9.20.1/C/Ppmd.h	Mon Jul 18 11:38:47 2011
@@ -29,7 +29,7 @@
 #define PPMD_N4 ((128 + 3 - 1 * PPMD_N1 - 2 * PPMD_N2 - 3 * PPMD_N3) / 4)
 #define PPMD_NUM_INDEXES (PPMD_N1 + PPMD_N2 + PPMD_N3 + PPMD_N4)
 
-#pragma pack(push,1)
+#pragma pack(1)
 
 /* SEE-contexts for PPM-contexts with masked symbols */
 typedef struct
@@ -50,7 +50,7 @@
   UInt16 SuccessorHigh;
 } CPpmd_State;
 
-#pragma pack(pop)
+#pragma pack()
 
 typedef
   #ifdef PPMD_32BIT