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sig2str: Align with POSIX:2024.
* lib/signal.in.h (SIG2STR_MAX): New macro.
(sig2str, str2sig): New declarations.
* lib/sig2str.h: Don't include intprops.h.
(SIG2STR_MAX): Remove macro.
(sig2str, str2sig): Remove declarations.
* lib/sig2str.c: Include <signal.h> as the specification header.
* m4/signal_h.m4 (gl_SIGNAL_H): Test whether sig2str, str2sig are
declared.
(gl_SIGNAL_H_REQUIRE_DEFAULTS): Initialize GNULIB_SIG2STR.
(gl_SIGNAL_H_DEFAULTS): Initialize HAVE_SIG2STR, HAVE_STR2SIG.
* m4/sig2str.m4 (gl_FUNC_SIG2STR): Require gl_SIGNAL_H_DEFAULTS. Check
also for str2sig. Set HAVE_SIG2STR, HAVE_STR2SIG.
* modules/signal-h (Makefile.am): Substitute GNULIB_SIG2STR,
HAVE_SIG2STR, HAVE_STR2SIG.
* modules/sig2str (Depends-on): Add signal-h. Remove intprops.
(configure.ac): Test HAVE_SIG2STR, HAVE_STR2SIG. Invoke
gl_SIGNAL_MODULE_INDICATOR.
(Include): Add <signal.h>.
* doc/posix-functions/sig2str.texi: Mention as implemented through the
sig2str module.
* doc/posix-functions/str2sig.texi: Likewise.