m4: want_prefetch.m4 - Modernize m4 syntax

diff --git a/m4/want_prefetch.m4 b/m4/want_prefetch.m4
index 49d2f65b06e349f0473f10d9e508a26d8920662b..007afd960e0fdf4e8d56d1e4604fb2606e51d2ca 100644 (file)
--- a/m4/want_prefetch.m4
+++ b/m4/want_prefetch.m4
@@ -1,8 +1,8 @@
 AC_DEFUN([DOVECOT_WANT_PREFETCH], [
-  if test $want_prefetch_userdb != no; then
-          AC_DEFINE(USERDB_PREFETCH,, [Build with prefetch userdb support])
-          userdb="$userdb prefetch"
-  else
-          not_userdb="$not_userdb prefetch"
-  fi
+  AS_IF([test "$want_prefetch_userdb" != "no"], [
+    AC_DEFINE(USERDB_PREFETCH,, [Build with prefetch userdb support])
+    userdb="$userdb prefetch"
+  ], [
+    not_userdb="$not_userdb prefetch"
+  ])
 ])