WOW64: Set the software CPU area flag

This is required for wow64.dll to setup the cross-process queue
that is used to pass through e.g. memory unmap events.

Source/Windows/include/winternl.h

@@ -13,8 +13,11 @@ extern "C" {
 #define NtCurrentProcess() ((HANDLE) ~(ULONG_PTR)0)
 #define NtCurrentThread() ((HANDLE) ~(ULONG_PTR)1)
 
+#define WOW64_TLS_WOW64INFO 10
 #define WOW64_TLS_MAX_NUMBER 19
 
+#define WOW64_CPUFLAGS_SOFTWARE 0x02
+
 #define STATUS_EMULATION_SYSCALL ((NTSTATUS)0x40000039)
 
 #ifdef _M_ARM_64EC
@@ -342,6 +345,16 @@ typedef struct __TEB {                          /* win32/win64 */
   GUID EffectiveContainerId;      /* ff0/1828 */
 } __TEB, *__PTEB;
 
+typedef struct _WOW64INFO {
+  ULONG NativeSystemPageSize;
+  ULONG CpuFlags;
+  ULONG Wow64ExecuteFlags;
+  ULONG unknown;
+  ULONGLONG SectionHandle;
+  ULONGLONG CrossProcessWorkList;
+  USHORT NativeMachineType;
+  USHORT EmulatedMachineType;
+} WOW64INFO;
 
 typedef struct _THREAD_BASIC_INFORMATION {
   NTSTATUS ExitStatus;