Update --with-astmoddir configure option (By request: Marcello)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4597 43c1dc8c-776e-4df2-8ef1-6e829299be21
Fix --with-astmoddir configure option (By request: Marcello)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4598 43c1dc8c-776e-4df2-8ef1-6e829299be21