resip/stack: add DtmfPayloadContents to Windows build

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@11111 ddefafc4-47db-0310-ae44-fa13212b10f2
resip/recon: add SipXHelper to Windows build

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@11112 ddefafc4-47db-0310-ae44-fa13212b10f2