Use gnu strdupa if available

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4528 43c1dc8c-776e-4df2-8ef1-6e829299be21
Use provided argv[2] instead of calling astman_get_header again

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4529 43c1dc8c-776e-4df2-8ef1-6e829299be21
Remove unnecessary call to strdupa. Pointer to astman_get_header should suffice (Needs to be copied to previous implementation when no side effects are noted)

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4530 43c1dc8c-776e-4df2-8ef1-6e829299be21
Copied loading order from astTrunk to other versions, so that chan-sccp-b is loaded later, and dialplan warnings should be reduced

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@4531 43c1dc8c-776e-4df2-8ef1-6e829299be21