Add missing DOM dependency in config.m4 for ext/xsl

Closes phpGH-13715.

Author: nielsdos

ext/xsl/config.m4

@@ -29,4 +29,5 @@ if test "$PHP_XSL" != "no"; then
   PHP_NEW_EXTENSION(xsl, php_xsl.c xsltprocessor.c, $ext_shared)
   PHP_SUBST(XSL_SHARED_LIBADD)
   PHP_ADD_EXTENSION_DEP(xsl, libxml)
+  PHP_ADD_EXTENSION_DEP(xsl, dom)
 fi