xscsize.c: Move reporting variables to a separate function.

xscsize.c: Move reporting variables to a separate function.

There are going to me more of them, and we won't know in advance how
many, so it'll be handy to have the output formatting in just one place.

This changes the detailed format of the output, but not in a way that
any actual shells will care about.  Specifically, each variable is now
output on a separate line; and for Bourne shells, the `export' command
is on the same line.