Flatten GNU Make directory structure

third_party/make/getprogname.h

@@ -0,0 +1,39 @@
+/* clang-format off */
+/* Program name management.
+   Copyright (C) 2016-2020 Free Software Foundation, Inc.
+
+   This program 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.
+
+   This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#ifndef _GL_GETPROGNAME_H
+#define _GL_GETPROGNAME_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Return the base name of the executing program.
+   On native Windows this will usually end in ".exe" or ".EXE". */
+#ifndef HAVE_GETPROGNAME
+extern char const *getprogname(void)
+#ifdef HAVE_DECL_PROGRAM_INVOCATION_NAME
+    _GL_ATTRIBUTE_PURE
+#endif
+    ;
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif