do not pass -u to fmt -- unsupported on osx

[jhoblitt]

The -u flag results in this error message on osx:

fmt: illegal option -- u
usage:   fmt [-cmps] [-d chars] [-l num] [-t num]
             [-w width | -width | goal [maximum]] [file ...]
Options: -c     center each line instead of formatting
         -d <chars> double-space after <chars> at line end
         -l <n> turn each <n> spaces at start of line into a tab
         -m     try to make sure mail header lines stay separate
         -n     format lines beginning with a dot
         -p     allow indented paragraphs
         -s     coalesce whitespace inside lines
         -t <n> have tabs every <n> columns
         -w <n> set maximum width to <n>
         goal   set target width to goal

[timj]

I don't actually know what -u does... But this seems fine.

[jhoblitt]

It normalizes white-space as in one space between words and two spaces after a period. I thought it was supported on osx for some reason. We can live without it.