Applied vodz' patches #49 and #50 (with a small correction in runshell.c)

#49: I found one memory overflow and memory leak in "ln" applet.
Last patch reduced also 54 bytes. ;)

#50: I found bug in loginutils/Makefile.in.
New patch have also new function to libbb and
aplied this to applets and other cosmetic changes.

archival/libunarchive/get_header_ar.c

@@ -91,8 +91,7 @@ file_header_t *get_header_ar(FILE *src_stream)
 		}
 	} else {
 		/* short filenames */
-		typed->name = xcalloc(1, 16);
-		strncpy(typed->name, ar.formated.name, 16);
+               typed->name = xstrndup(ar.formated.name, 16);
 	}
 	typed->name[strcspn(typed->name, " /")]='\0';