Remove root library check for dlopen() and dlsym() (#13086)

The root library was added here for the Haiku system, to check dlopen()
and dlsym(). However, the root library is already explicitly linked in
the system, and it does not need to be checked neither linked anymore,
since at least ~2013.

Author: petk

configure.ac

@@ -365,8 +365,8 @@ PHP_CHECK_FUNC(socketpair, socket, network)
 PHP_CHECK_FUNC(htonl, socket, network)
 PHP_CHECK_FUNC(gethostname, nsl, network)
 PHP_CHECK_FUNC(gethostbyaddr, nsl, network)
-PHP_CHECK_FUNC(dlopen, dl, root)
-PHP_CHECK_FUNC(dlsym, dl, root)
+PHP_CHECK_FUNC(dlopen, dl)
+PHP_CHECK_FUNC(dlsym, dl)
 if test "$ac_cv_func_dlopen" = "yes"; then
   AC_DEFINE(HAVE_LIBDL, 1, [ ])
 fi