Add a check for recentness of the new svn:externals
in tcnative to the release script.

Note: the script now warns if the peg revision
of the external doesn't match the last changed
rev of jni in Tomcat trunk. It then pauses for
three seconds and you need to CTRL-C it, if you
want to fix the external before releasing.
Otherwise after three seconds it proceeds and
uses whatever externals revision was set.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/native/branches/1.1.x@1447045 13f79535-47bb-0310-9956-ffa450edef68