Bigger patch for (partial) tinylogin integration

- Made a new dir loginutils
- Moved all applets from pwd_grp to loginutils
- Added new applets su.c login.c to loginutils
- Made a new dir libpwdgrp
- Moved everything from pwd_grp/libpwd_grp there
- Added shadow.c to libpwdgrp
- Removed dir pwd_grp
- Added usage strings for login and su to usage.h
- Changed main Makefile to reflect the dir rearrangements
[Parts of this patch may overlap with my other two patches]

libpwdgrp/Makefile.in

@@ -0,0 +1,35 @@
+# Makefile for busybox
+#
+# Copyright (C) 1999-2002 Erik Andersen <andersee@debian.org>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+# General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+
+LIBPWDGRP_AR:=libpwdgrp.a
+ifndef $(LIBPWDGRP_DIR)
+LIBPWDGRP_DIR:=$(TOPDIR)libpwdgrp/
+endif
+
+LIBPWDGRP-y:=
+LIBPWDGRP-$(CONFIG_USE_BB_PWD_GRP) += __getgrent.o __getgrent.o __getpwent.o\
+	fgetgrent.o fgetpwent.o getgrgid.o getgrnam.o getpw.o getpwnam.o \
+	getpwuid.o grent.o initgroups.o putpwent.o pwent.o setgroups.o
+LIBPWDGRP-$(CONFIG_USE_BB_SHADOW) += shadow.o
+
+libraries-y+=$(LIBPWDGRP_DIR)$(LIBPWDGRP_AR)
+
+$(LIBPWDGRP_DIR)$(LIBPWDGRP_AR): $(patsubst %,$(LIBPWDGRP_DIR)%, $(LIBPWDGRP-y))
+	$(AR) -ro $@ $(patsubst %,$(LIBPWDGRP_DIR)%, $(LIBPWDGRP-y))
+