util/error: expose Error definition to Rust code

This is used to preserve the file and line in a roundtrip from
C Error to Rust and back to C.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/qapi/error-internal.h

@@ -0,0 +1,26 @@
+/*
+ * QEMU Error Objects - struct definition
+ *
+ * Copyright IBM, Corp. 2011
+ * Copyright (C) 2011-2015 Red Hat, Inc.
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *  Markus Armbruster <armbru@redhat.com>,
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.  See
+ * the COPYING.LIB file in the top-level directory.
+ */
+
+#ifndef QAPI_ERROR_INTERNAL_H
+
+struct Error
+{
+    char *msg;
+    ErrorClass err_class;
+    const char *src, *func;
+    int line;
+    GString *hint;
+};
+
+#endif

rust/wrapper.h

@@ -60,6 +60,7 @@ typedef enum memory_order {
 #include "hw/qdev-properties-system.h"
 #include "hw/irq.h"
 #include "qapi/error.h"
+#include "qapi/error-internal.h"
 #include "migration/vmstate.h"
 #include "chardev/char-serial.h"
 #include "exec/memattrs.h"

util/error.c

@@ -15,15 +15,7 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
-
-struct Error
-{
-    char *msg;
-    ErrorClass err_class;
-    const char *src, *func;
-    int line;
-    GString *hint;
-};
+#include "qapi/error-internal.h"
 
 Error *error_abort;
 Error *error_fatal;