Let the width of the username column depend on the rwho file format.

Right now the code uses UT_NAMESIZE, but this makes little sense,
because rwho(1) parses files generated by rwhod(8). Not utmp(5) files.

usr.bin/rwho/rwho.c

@@ -61,7 +61,6 @@ __FBSDID("$FreeBSD$");
 #include <time.h>
 #include <timeconv.h>
 #include <unistd.h>
-#include <utmp.h>
 
 DIR	*dirp;
 
@@ -172,7 +171,7 @@ main(int argc, char *argv[])
 		(void)sprintf(buf, "%s:%-.*s", mp->myhost,
 		   sizeof(mp->myutmp.out_line), mp->myutmp.out_line);
 		printf("%-*.*s %-*s %s",
-		   UT_NAMESIZE, sizeof(mp->myutmp.out_name),
+		   sizeof(mp->myutmp.out_name), sizeof(mp->myutmp.out_name),
 		   mp->myutmp.out_name,
 		   width,
 		   buf,