The error string
missing @ or \ in name
must have the backslash double quoted as
missing @ or \\\\ in name
because of how compile_et parses the input and generates its output.
Otherwise, when compiling the generated ntlm_err.c a warning will
be produced because of invalid quoting of a space.
Change-Id: I994d3eb896098914702e418a0ef5cad783d16a5a