Fix build breakage caused by r1717474 in perl < 5.13.6 (mg_free_type() was added in 5.13.6).

Spotted by Rainer Jung <rainer.jung@kippdata.de>.

git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/trunk@1777355 13f79535-47bb-0310-9956-ffa450edef68
1 file changed