headers: Add DECLSPEC_CHPE_PATCHABLE define

Signed-off-by: Jacek Caban <jacek@codeweavers.com>

mingw-w64-headers/include/winnt.h

diff --git a/mingw-w64-headers/include/winnt.h b/mingw-w64-headers/include/winnt.h
index 188234a..d094e07 100644
--- a/mingw-w64-headers/include/winnt.h
+++ b/mingw-w64-headers/include/winnt.h
@@ -268,6 +268,14 @@
 #endif
 #endif
 
+#ifndef DECLSPEC_CHPE_PATCHABLE
+#ifdef __arm64ec__
+#define DECLSPEC_CHPE_PATCHABLE __declspec(hybrid_patchable)
+#else
+#define DECLSPEC_CHPE_PATCHABLE
+#endif
+#endif
+
 #define DECLSPEC_DEPRECATED_DDK
 #define PRAGMA_DEPRECATED_DDK 0