Remove Gnulib generated file.

This was inadvertently committed in edfca3b7e5.

* lib/stdbool.h: Delete.

lib/stdbool.h

@@ -1,116 +0,0 @@
-/* DO NOT EDIT! GENERATED AUTOMATICALLY! */
-/* Copyright (C) 2001-2003, 2006-2022 Free Software Foundation, Inc.
-   Written by Bruno Haible <haible@clisp.cons.org>, 2001.
-
-   This file is free software: you can redistribute it and/or modify
-   it under the terms of the GNU Lesser General Public License as
-   published by the Free Software Foundation; either version 2.1 of the
-   License, or (at your option) any later version.
-
-   This file 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 Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public License
-   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
-
-#ifndef _GL_STDBOOL_H
-#define _GL_STDBOOL_H
-
-/* ISO C 99 <stdbool.h> for platforms that lack it.  */
-
-/* Usage suggestions:
-
-   Programs that use <stdbool.h> should be aware of some limitations
-   and standards compliance issues.
-
-   Standards compliance:
-
-       - <stdbool.h> must be #included before 'bool', 'false', 'true'
-         can be used.
-
-       - You cannot assume that sizeof (bool) == 1.
-
-       - Programs should not undefine the macros bool, true, and false,
-         as C99 lists that as an "obsolescent feature".
-
-   Limitations of this substitute, when used in a C89 environment:
-
-       - <stdbool.h> must be #included before the '_Bool' type can be used.
-
-       - You cannot assume that _Bool is a typedef; it might be a macro.
-
-       - Bit-fields of type 'bool' are not supported.  Portable code
-         should use 'unsigned int foo : 1;' rather than 'bool foo : 1;'.
-
-       - In C99, casts and automatic conversions to '_Bool' or 'bool' are
-         performed in such a way that every nonzero value gets converted
-         to 'true', and zero gets converted to 'false'.  This doesn't work
-         with this substitute.  With this substitute, only the values 0 and 1
-         give the expected result when converted to _Bool' or 'bool'.
-
-       - C99 allows the use of (_Bool)0.0 in constant expressions, but
-         this substitute cannot always provide this property.
-
-   Also, it is suggested that programs use 'bool' rather than '_Bool';
-   this isn't required, but 'bool' is more common.  */
-
-
-/* 7.16. Boolean type and values */
-
-#ifdef __cplusplus
-# define _Bool bool
-# define bool bool
-#else
-# if !defined __GNUC__
-   /* If 1:
-        Some HP-UX cc and AIX IBM C compiler versions have compiler bugs when
-        the built-in _Bool type is used.  See
-          https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
-          https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
-          https://lists.gnu.org/r/bug-coreutils/2005-10/msg00086.html
-        Similar bugs are likely with other compilers as well; this file
-        wouldn't be used if <stdbool.h> was working.
-        So we override the _Bool type.
-      If !1:
-        Need to define _Bool ourselves. As 'signed char' or as an enum type?
-        Use of a typedef, with SunPRO C, leads to a stupid
-          "warning: _Bool is a keyword in ISO C99".
-        Use of an enum type, with IRIX cc, leads to a stupid
-          "warning(1185): enumerated type mixed with another type".
-        Even the existence of an enum type, without a typedef,
-          "Invalid enumerator. (badenum)" with HP-UX cc on Tru64.
-        The only benefit of the enum, debuggability, is not important
-        with these compilers.  So use 'signed char' and no enum.  */
-#  define _Bool signed char
-# else
-   /* With this compiler, trust the _Bool type if the compiler has it.  */
-#  if !1
-   /* For the sake of symbolic names in gdb, define true and false as
-      enum constants, not only as macros.
-      It is tempting to write
-         typedef enum { false = 0, true = 1 } _Bool;
-      so that gdb prints values of type 'bool' symbolically.  But then
-      values of type '_Bool' might promote to 'int' or 'unsigned int'
-      (see ISO C 99 6.7.2.2.(4)); however, '_Bool' must promote to 'int'
-      (see ISO C 99 6.3.1.1.(2)).  So add a negative value to the
-      enum; this ensures that '_Bool' promotes to 'int'.  */
-typedef enum { _Bool_must_promote_to_int = -1, false = 0, true = 1 } _Bool;
-#  endif
-# endif
-# define bool _Bool
-#endif
-
-/* The other macros must be usable in preprocessor directives.  */
-#ifdef __cplusplus
-# define false false
-# define true true
-#else
-# define false 0
-# define true 1
-#endif
-
-#define __bool_true_false_are_defined 1
-
-#endif /* _GL_STDBOOL_H */