the page margins are integers

[janstary]

u2ps_opts.c:31:19: warning: implicit conversion from 'double' to 'int' changes value from 57.5 to 57 [-Wliteral-conversion]
        .mb = 55,  .mr = 57.5
                         ^~~~
u2ps_opts.c:30:19: warning: implicit conversion from 'double' to 'int' changes value from 57.5 to 57 [-Wliteral-conversion]
        .mt = 55,  .ml = 57.5,      /* some reasonable margins */
                         ^~~~