libnfsidmap: drop package

This package seems to not be used anywhere. nfs-utils were dropped and
are now maintained by uptream so this should not be in our repository.

libs/libnfsidmap/Makefile

-#
-# Copyright (C) 2007 OpenWrt.org
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
-# $Id$
-
-include $(TOPDIR)/rules.mk
-
-PKG_NAME:=libnfsidmap
-PKG_VERSION:=0.25
-PKG_RELEASE:=0
-
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=http://www.citi.umich.edu/projects/nfsv4/linux/libnfsidmap/
-PKG_MD5SUM:=2ac4893c92716add1a1447ae01df77ab
-
-include $(INCLUDE_DIR)/package.mk
-
-define Package/libnfsidmap
-  SECTION:=libs
-  CATEGORY:=Libraries
-  TITLE:=libnfsidmap, for compiling mount.nfs4
-  URL:=http://www.citi.umich.edu/projects/nfsv4
-endef
-
-define Package/libnfsidmap/description
-  Library needed by nfs-utils
-endef
-
-TARGET_CFLAGS += -I$(PKG_BUILD_DIR)/lib
-
-MAKE_FLAGS += \
-        OPT="$(TARGET_CFLAGS)" \
-        INSTALLSUID="install -m 4755" \
-        DESTDIR="$(PKG_INSTALL_DIR)" \
-        all
-
-define Build/InstallDev
-	$(MAKE) -C "$(PKG_BUILD_DIR)" INSTALLSUID="install -m 4755" DESTDIR="$(1)" install
-	find "$(1)" -name '*.a' -delete
-endef
-
-define Package/libnfsidmap/install
-	$(MAKE) -C "$(PKG_BUILD_DIR)" INSTALLSUID="install -m 4755" DESTDIR="$(1)" install
-	find "$(1)" -name '*.a' -delete
-	rm -rf "$(1)"/usr/include
-	rm -rf "$(1)"/usr/man
-	rm -rf "$(1)"/usr/lib/pkgconfig
-endef
-
-$(eval $(call BuildPackage,libnfsidmap))

libs/libnfsidmap/patches/sys-types.patch

---- ./cfg.h.bak 2017-08-28 14:56:28.813736854 +0200
-+++ ./cfg.h     2017-08-28 14:56:43.118215951 +0200
-@@ -34,6 +34,7 @@
- #define _CONF_H_
- 
- #include "queue.h"
-+#include <sys/types.h>
- 
- struct conf_list_node {
-        TAILQ_ENTRY(conf_list_node) link;