[neard][PATCH 2/8] build: replace deprecated AC_HELP_STRING

AC_HELP_STRING is deprecated in favor of AS_HELP_STRING at least since
autoconf v2.60.  In autoconf v2.71 (used on current ArchLinux and Fedora
Rawhide) this causes error:

  configure.ac:112: warning: The macro `AC_HELP_STRING' is obsolete.
  configure.ac:112: You should run autoupdate.

Signed-off-by: Krzysztof Kozlowski <[email protected]>
---
 configure.ac | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure.ac b/configure.ac
index a1f7bd8bf56a..2cf9a19e4fab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -109,7 +109,7 @@ save_LIBS=$LIBS
 AC_CHECK_LIB(asan, _init)
 LIBS=$save_LIBS
 
-AC_ARG_ENABLE(asan, AC_HELP_STRING([--enable-asan],
+AC_ARG_ENABLE(asan, AS_HELP_STRING([--enable-asan],
 			[enable linking with address sanitizer]), [
 	if (test "${enableval}" = "yes" &&
 				test "${ac_cv_lib_asan__init}" = "yes" &&
@@ -123,7 +123,7 @@ save_LIBS=$LIBS
 AC_CHECK_LIB(lsan, _init)
 LIBS=$save_LIBS
 
-AC_ARG_ENABLE(lsan, AC_HELP_STRING([--enable-lsan],
+AC_ARG_ENABLE(lsan, AS_HELP_STRING([--enable-lsan],
 			[enable linking with leak sanitizer]), [
 	if (test "${enableval}" = "yes" &&
 				test "${ac_cv_lib_lsan__init}" = "yes" &&
@@ -137,7 +137,7 @@ save_LIBS=$LIBS
 AC_CHECK_LIB(ubsan, _init)
 LIBS=$save_LIBS
 
-AC_ARG_ENABLE(ubsan, AC_HELP_STRING([--enable-ubsan],
+AC_ARG_ENABLE(ubsan, AS_HELP_STRING([--enable-ubsan],
 			[enable linking with undefined behavior sanitizer]), [
 	if (test "${enableval}" = "yes" &&
 				test "${ac_cv_lib_ubsan__init}" = "yes" &&
-- 
2.30.2