HV_DENIED was added to Hypervisor.framework's hv_return_t in the macOS 11 SDK;
the 10.15 SDK stops at HV_UNSUPPORTED.  qemu 11.1.0 uses it in a diagnostic
string table and in a comparison against hvf_arch_vm_create().

The value (err_common_hypervisor | 0x07) is taken verbatim from the 11.1 SDK's
Hypervisor/hv_error.h, so the runtime comparison stays correct rather than
merely compiling.

--- accel/hvf/hvf-all.c.orig
+++ accel/hvf/hvf-all.c
@@ -9,6 +9,15 @@
  */
 
 #include "qemu/osdep.h"
+
+/* HV_DENIED was added to Hypervisor.framework's hv_return_t in the macOS 11
+ * SDK; the 10.15 SDK stops at HV_UNSUPPORTED.  Value taken verbatim from the
+ * 11.1 SDK's hv_error.h so the runtime comparison stays correct. */
+#if !defined(MAC_OS_VERSION_11_0) || \
+    MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_VERSION_11_0
+#include <Hypervisor/hv_error.h>
+#define HV_DENIED (err_common_hypervisor | 0x07)
+#endif
 #include "qemu/error-report.h"
 #include "qapi/error.h"
 #include "qapi/qapi-visit-common.h"