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fix packed attribute for structs when compiling with MSVC

Thanks @drfrag666 for confirming this fix.

--- a/src/doomtype.h

+++ b/src/doomtype.h

@@ -70,7 +70,11 @@

 #define NORETURN __attribute__((noreturn))

 #else

+#if defined(_MSC_VER)

+#define PACKEDATTR __pragma(pack(pop))

+#else

 #define PACKEDATTR

+#endif

 #define PRINTF_ATTR(fmt, first)

 #define PRINTF_ARG_ATTR(x)

 #define NORETURN

@@ -78,6 +82,8 @@

 #ifdef __WATCOMC__

 #define PACKEDPREFIX _Packed

+#elif defined(_MSC_VER)

+#define PACKEDPREFIX __pragma(pack(push,1))

 #else

 #define PACKEDPREFIX

 #endif