Add forgotten '|| true' to prevent 'make install-man' from returning an error...

Add forgotten '|| true' to prevent 'make install-man' from returning an error (if rsync is not present on the platform)

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.2.x@531878 13f79535-47bb-0310-9956-ffa450edef68