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.
diff --git a/loginutils/Makefile.in b/loginutils/Makefile.in
index cb6452c..1c5680a 100644
--- a/loginutils/Makefile.in
+++ b/loginutils/Makefile.in
@@ -40,7 +40,7 @@
 needcrypt-$(CONFIG_SU)    := y
 
 ifeq ($(needcrypt-y),y)
-  libraries-y +=-lcrypt
+  LIBRARIES += -lcrypt
 endif
 
 $(LOGINUTILS_DIR)$(LOGINUTILS_AR): $(patsubst %,$(LOGINUTILS_DIR)%, $(LOGINUTILS-y))