Added struct sccp_display_capability. Re-aligned sccp_protocol.h manually

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4405 43c1dc8c-776e-4df2-8ef1-6e829299be21
Updated configure

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4406 43c1dc8c-776e-4df2-8ef1-6e829299be21
Re-aligned sccp_protocol.h manually

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4407 43c1dc8c-776e-4df2-8ef1-6e829299be21