Error out on memory failures in fargs_cmdline() and addargs() in both
cases it was impossible to start the remote rsync anyway. Also now
fargs_cmdline() can no longer fail. Add missing err(ERR_IPC, "

Error out on memory failures in fargs_cmdline() and addargs() in both
cases it was impossible to start the remote rsync anyway. Also now
fargs_cmdline() can no longer fail. Add missing err(ERR_IPC, "pldege")
for the cases in socket.c
OK benno@

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Make fmt argument const. Format local vars a bit.
From kristaps@

Pull in addargs() API from ssh to replace complicated hand-rolled argument
composition code for the remote process.
ok florian naddy