Replace autotools macro AC_HELP_STRING with AS_HELP_STRING.

In minizip's configure.ac. AC_HELP_STRING is obsolete.

Author: matlo607

contrib/minizip/configure.ac

@@ -7,7 +7,7 @@ AM_INIT_AUTOMAKE([foreign])
 LT_INIT
 
 AC_MSG_CHECKING([whether to build example programs])
-AC_ARG_ENABLE([demos], AC_HELP_STRING([--enable-demos], [build example programs]))
+AC_ARG_ENABLE([demos], AS_HELP_STRING([--enable-demos], [build example programs]))
 AM_CONDITIONAL([COND_DEMOS], [test "$enable_demos" = yes])
 if test "$enable_demos" = yes
 then