makeinfo: accents in the third argument of deffn

[Akim Demaille]

... don't seem to be obeyed.

src/texinfo/test-cases % eof accent-in-deffn-3rd-arg.texi        nostromo 13:49
: -------------------- accent-in-deffn-3rd-arg.texi ----------------------
cat > accent-in-deffn-3rd-arg.texi << \EOF
\input texinfo   @c -*-texinfo-*-
@setfilename bug
@settitle bug

@ifnottex
@node Top
@top TITLE
@end ifnottex

@deffn {1 Dejan Jelovi@'c 1} {2 Dejan Jelovi@'c 2} {3 Dejan Jelovi@'c 3}
4 Dejan Jelovi@'c 4
@end deffn

@bye
EOF
: ------------------------------------------------------------
src/texinfo/test-cases % LC_ALL=C makeinfo --no-header < 
accent-in-deffn-3rd-arg.texi                             
TITLE
*****

stdin:11: warning: cacute is an invalid ISO code, using '.
stdin:11: warning: cacute is an invalid ISO code, using '.
 - 1 Dejan Jelovic' 1: 2 Dejan Jelovic' 2 3 Dejan Jelovi@'c 3
stdin:11: warning: cacute is an invalid ISO code, using '.
     4 Dejan Jelovic' 4



Note the occurrence between 3s.