Extract usage information into a separate file.

rm.c

@@ -29,17 +29,6 @@
 #include <dirent.h>
 #include <errno.h>
 
-static const char *rm_usage = "rm [OPTION]... FILE...\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-	"\nRemove (unlink) the FILE(s).  You may use '--' to\n"
-	"indicate that all following arguments are non-options.\n\n"
-	"Options:\n"
-	"\t-f\t\tremove existing destinations, never prompt\n"
-	"\t-r or -R\tremove the contents of directories recursively\n"
-#endif
-	;
-
-
 static int recursiveFlag = FALSE;
 static int forceFlag = FALSE;
 static const char *srcName;