Rename buf_append() in cstp.c to cbuf_append()
Rename buf_append() in cstp.c to cbuf_append()

We're about to make it use the nicer buf_append() from http.c but let's
make the simple change to avoid the conflict first...

Signed-off-by: David Woodhouse <b460d66aaf00c296a3db1c1d9eeafc081d5f7d70@intel.com>

mveplus/openconnect-client,liiir1985/openconnect,atyndall/openconnect,liiir1985/openconnect,cernekee/openconnect,chadcatlett/openconnect,don-johnny/openconnect,liiir1985/openconnect,atyndall/openconnect,matlockx/openconnect,mveplus/openconnect-client,chadcatlett/openconnect,matlockx/openconnect,nmav/openconnect-mine,cernekee/openconnect,don-johnny/openconnect,lins05/openconnect,nmav/openconnect-mine,mtmiller/openconnect,lins05/openconnect,liiir1985/openconnect,brandt/openconnect,brandt/openconnect,mveplus/openconnect-client,lins05/openconnect,chadcatlett/openconnect,mtmiller/openconnect,don-johnny/openconnect,atyndall/openconnect,matlockx/openconnect,brandt/openconnect,mtmiller/openconnect,nmav/openconnect-mine,lins05/openconnect,neshema/openconnect,nmav/openconnect-mine,neshema/openconnect,mveplus/openconnect-client,mtmiller/openconnect,matlockx/openconnect,neshema/openconnect,cernekee/openconnect,brandt/openconnect,chadcatlett/openconnect,cernekee/openconnect,atyndall/openconnect,neshema/openconnect,don-johnny/openconnect