Convert avro headers to .hh

Required for converting maxscale/buffer.h.

avro/test/test_values.cc

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2022-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+
+#include <maxavro.hh>
+#include <stdio.h>
+#include <string.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <errno.h>
+
+const char* testfile = "test.db";
+const char* testschema = "";
+
+void write_file()
+{
+    FILE* file = fopen(testfile, "wb");
+    fclose(file);
+}
+
+int main(int argc, char** argv)
+{
+    MAXAVRO_FILE* file = maxavro_file_open(testfile);
+
+    if (!file)
+    {
+        return 1;
+    }
+
+    uint64_t blocks = 0;
+
+    while (maxavro_next_block(file))
+    {
+        blocks++;
+    }
+
+    uint64_t blocksread = file->blocks_read;
+    maxavro_file_close(file);
+    return blocks != blocksread;
+}