[skip ci] Move php_fpm_systemd substitution after its check

Author: petk

sapi/fpm/config.m4

@@ -472,6 +472,8 @@ if test "$PHP_FPM" != "no"; then
     CFLAGS=$CFLAGS_save
   ])
 
+  AC_SUBST([php_fpm_systemd])
+
   if test "$PHP_FPM_ACL" != "no" ; then
     AC_CHECK_HEADERS([sys/acl.h])
 
@@ -534,8 +536,6 @@ if test "$PHP_FPM" != "no"; then
     CFLAGS="$CFLAGS_save"
   fi
 
-  AC_SUBST([php_fpm_systemd])
-
   if test -z "$PHP_FPM_USER" || test "$PHP_FPM_USER" = "yes" || test "$PHP_FPM_USER" = "no"; then
     php_fpm_user="nobody"
   else