bash versus printf -exported_symbol on OSF

[Kevin Ryde]

For cxx on "osf4* | osf5*", libtool uses

        printf "-exported_symbol "

as part of archive_expsym_cmds.  Unfortunately bash 2.05b objects to
this with

        printf: -e: invalid option

The bash doco doesn't mention any options for printf, but I suppose it
parses them in the usual way.  Unlike /usr/bin/printf on OSF, which is
happy just to print "-exported..."

Using "printf -- -exported_symbol " seems to work with both bash and
/usr/bin/printf.  Unless anyone knows better perhaps this would be a
good change.