Extract usage information into a separate file.

coreutils/yes.c

@@ -23,13 +23,6 @@
 #include "internal.h"
 #include <stdio.h>
 
-const char yes_usage[] =
-	"yes [OPTION]... [STRING]...\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-	"\nRepeatedly outputs a line with all specified STRING(s), or `y'.\n"
-#endif
-	;
-
 extern int yes_main(int argc, char **argv)
 {
 	int i;