Previous change to wrapper.sh naively read $(<etc/gridargs.dat) directly into
the viewer binary command line. But gridargs.dat contains quoted args as well
as simple space-separated ones: need bash to scan the file using eval. This
was why the older logic used eval on the entire command line. However, we must
use eval only for gridargs.dat so we don't lose individual quoting on
arguments passed to the secondlife script.