Add bash 5.2 to third_party

third_party/bash/patchlevel.h

@@ -0,0 +1,30 @@
+/* patchlevel.h -- current bash patch level */
+
+/* Copyright (C) 2001-2021 Free Software Foundation, Inc.
+
+   This file is part of GNU Bash, the Bourne Again SHell.
+
+   Bash is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Bash is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Bash.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#if !defined (_PATCHLEVEL_H_)
+#define _PATCHLEVEL_H_
+
+/* It's important that there be no other strings in this file that match the
+   regexp `^#define[ 	]*PATCHLEVEL', since that's what support/mkversion.sh
+   looks for to find the patch level (for the sccs version string). */
+
+#define PATCHLEVEL 0
+
+#endif /* _PATCHLEVEL_H_ */