headers: Add the DISPATCHER_CONTEXT_NONVOLREG_ARM64 data type

This is available in WinSDK since 10.0.22000.0.

Signed-off-by: Martin Storsjö <martin@martin.st>

mingw-w64-headers/include/winnt.h

diff --git a/mingw-w64-headers/include/winnt.h b/mingw-w64-headers/include/winnt.h
index 4d920fd..9e57bb1 100644
--- a/mingw-w64-headers/include/winnt.h
+++ b/mingw-w64-headers/include/winnt.h
@@ -2454,6 +2454,21 @@
 #define UNW_FLAG_EHANDLER   0x1
 #define UNW_FLAG_UHANDLER   0x2
 
+#define NONVOL_INT_NUMREG_ARM64 (11)
+#define NONVOL_FP_NUMREG_ARM64 (8)
+
+#define NONVOL_INT_SIZE_ARM64 (NONVOL_INT_NUMREG_ARM64 * sizeof(DWORD64))
+#define NONVOL_FP_SIZE_ARM64 (NONVOL_FP_NUMREG_ARM64 * sizeof(double))
+
+  typedef union _DISPATCHER_CONTEXT_NONVOLREG_ARM64 {
+    BYTE Buffer[NONVOL_INT_SIZE_ARM64 + NONVOL_FP_SIZE_ARM64];
+
+    __C89_NAMELESS struct {
+        DWORD64 GpNvRegs[NONVOL_INT_NUMREG_ARM64];
+        double FpNvRegs[NONVOL_FP_NUMREG_ARM64];
+    } DUMMYSTRUCTNAME;
+  } DISPATCHER_CONTEXT_NONVOLREG_ARM64;
+
   typedef struct _DISPATCHER_CONTEXT_ARM64 {
     ULONG_PTR ControlPc;
     ULONG_PTR ImageBase;