shadow: use proper fix for checking subordinate IDs support

During 4.2.1 version update support for subordinate IDs has been
disabled. It was handled by:

1) Adding --disable-subordinate-ids to avoid:
configure: error: cannot run test program while cross compiling

2) Adding patch 003-fix-disabling-subids.patch to avoid:
usermod.c: In function 'process_flags':
usermod.c:1364:10: error: 'vflg' undeclared (first use in this function)
  if (   (vflg || Vflg)
          ^

This commit adds a patch with a proper configure.in fix. We don't need
to disable subordinate IDs anymore.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

utils/shadow/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=shadow
 PKG_VERSION:=4.2.1
-PKG_RELEASE:=6
+PKG_RELEASE:=7
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:=http://pkg-shadow.alioth.debian.org/releases
@@ -37,8 +37,7 @@ CONFIGURE_ARGS += \
 	--without-acl \
 	--without-attr \
 	--without-tcb \
-	--without-nscd \
-	--disable-subordinate-ids \
+	--without-nscd
 
 define Package/shadow/Default
   SECTION:=utils