include: add missing EntryInProgress member to _PEB_LDR_DATA struct

[Austin English]

Fixes https://bugs.winehq.org/show_bug.cgi?id=36491.

Found by Anastasius Focht.

-- 
-Austin
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diff --git a/include/winternl.h b/include/winternl.h
index d93b37a..edc8dfd 100644
--- a/include/winternl.h
+++ b/include/winternl.h
@@ -191,6 +191,7 @@ typedef struct _PEB_LDR_DATA
     LIST_ENTRY          InLoadOrderModuleList;
     LIST_ENTRY          InMemoryOrderModuleList;
     LIST_ENTRY          InInitializationOrderModuleList;
+    PVOID               EntryInProgress;
 } PEB_LDR_DATA, *PPEB_LDR_DATA;
 
 typedef struct _GDI_TEB_BATCH