[v9_9] isc_errno_toresult()

4445.	[cleanup]	isc_errno_toresult() can now be used to call the
			formerly private function isc__errno2result().
			[RT #43050]

(cherry picked from commit ddef16e1d9)

lib/isc/include/isc/errno.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2016  Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef ISC_ERRNO_H
+#define ISC_ERRNO_H 1
+
+/*! \file isc/file.h */
+
+#include <isc/types.h>
+
+ISC_LANG_BEGINDECLS
+
+isc_result_t
+isc_errno_toresult(int err);
+/*!<
+ * \brief Convert a POSIX errno value to an ISC result code.
+ */
+ISC_LANG_ENDDECLS
+
+#endif /* ISC_ERRNO_H */