Convert AC_HELP_STRING to AS_HELP_STRING

This is a straightforward replacement prompted by a
warning from newer versions of Autoconf.

IWBN to upstream some of these changes.

* m4/as-auto-alt.m4 (--with-autoconf)
(--with-autoheader, --with-automake, --with-aclocal): ...here.
* m4/libcurl.m4 (--with-libcurl): Likewise.
* m4/libgcrypt.m4 (--with-libgcrypt-prefix): Likewise.
* m4/libgnurl.m4 (--with-libgnurl): Likewise.
* m4/threadlib.m4 (--enable-threads, --disable-threads): Likewise.

1 files changed, 2 insertions, 2 deletions

diff --git a/m4/threadlib.m4 b/m4/threadlib.m4
index dc9a3d8e8..80af285bf 100644
--- a/m4/threadlib.m4
+++ b/m4/threadlib.m4
@@ -53,8 +53,8 @@ AC_DEFUN([gl_THREADLIB_EARLY_BODY],
     [m4_divert_text([DEFAULTS], [gl_use_threads_default=no])],
     [m4_divert_text([DEFAULTS], [gl_use_threads_default=])])
   AC_ARG_ENABLE([threads],
-AC_HELP_STRING([--enable-threads={posix|solaris|pth|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [
-AC_HELP_STRING([--disable-threads], [build without multithread safety])]),
+AS_HELP_STRING([--enable-threads={posix|solaris|pth|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [
+AS_HELP_STRING([--disable-threads], [build without multithread safety])]),
     [gl_use_threads=$enableval],
     [if test -n "$gl_use_threads_default"; then
        gl_use_threads="$gl_use_threads_default"