configure: replace deprecated macros

* use LT_INIT instead of deprecated AC_PROG_LIBTOOL
* use AS_HELP_STRING instead of deprecated AC_HELP_STRING
* quote macros

configure.ac

@@ -1,5 +1,5 @@
-AC_PREREQ(2.57)
-AC_INIT(popt, 1.18, rpm-maint@lists.rpm.org)
+AC_PREREQ([2.57])
+AC_INIT([popt], [1.18], [rpm-maint@lists.rpm.org])
 AC_CONFIG_SRCDIR([src/popt.h])
 AC_CONFIG_HEADERS([config.h])
 
@@ -14,11 +14,11 @@ AC_USE_SYSTEM_EXTENSIONS
 AM_PROG_AR
 
 AC_PROG_INSTALL
-AC_PROG_LIBTOOL
+LT_INIT
 
 AC_SYS_LARGEFILE
 
-AC_CHECK_HEADERS(fnmatch.h glob.h langinfo.h libintl.h mcheck.h stdalign.h)
+AC_CHECK_HEADERS([fnmatch.h glob.h langinfo.h libintl.h mcheck.h stdalign.h])
 
 # For some systems we know that we have ld_version scripts.
 # Use it then as default.
@@ -32,15 +32,15 @@ case "${host}" in
         ;;
 esac
 AC_ARG_ENABLE([ld-version-script],
-              AC_HELP_STRING([--enable-ld-version-script],
+              [AS_HELP_STRING([--enable-ld-version-script],
                              [enable/disable use of linker version script.
-                              (default is system dependent)]),
+                              (default is system dependent)])],
               [have_ld_version_script=$enableval],
               [ : ] )
 AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = "yes")
 
-AC_ARG_ENABLE(build-gcov,
-    AS_HELP_STRING([--enable-build-gcov], [build POPT instrumented for gcov]), [dnl
+AC_ARG_ENABLE([build-gcov],
+    [AS_HELP_STRING([--enable-build-gcov], [build POPT instrumented for gcov])], [dnl
     if test ".$enableval" = .yes; then
         if test ".`$CC --version 2>&1 | grep 'GCC'`" != .; then
             dnl # GNU GCC (usually "gcc")
@@ -49,8 +49,8 @@ AC_ARG_ENABLE(build-gcov,
     fi
 ])
 
-AC_SEARCH_LIBS(setreuid, [ucb])
-AC_CHECK_FUNCS(getuid geteuid iconv mtrace secure_getenv __secure_getenv setreuid setuid stpcpy strerror vasprintf srandom glob_pattern_p)
+AC_SEARCH_LIBS([setreuid], [ucb])
+AC_CHECK_FUNCS([getuid geteuid iconv mtrace secure_getenv __secure_getenv setreuid setuid stpcpy strerror vasprintf srandom glob_pattern_p])
 
 AM_GNU_GETTEXT_VERSION([0.18.2])
 AM_GNU_GETTEXT([external])