libconfig: move into packages feed

No package in base uses libconfig. Everything is in the packages feed.

Ref: https://github.com/openwrt/packages/pull/12255
Signed-off-by: Rosen Penev <rosenp@gmail.com>
[subject facelift, PR ref]
Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/libs/libconfig/Makefile

@@ -1,60 +0,0 @@
-#
-# Copyright (C) 2008-2012 OpenWrt.org
-#
-# This is free software, licensed under the GNU General Public License v2.
-# See /LICENSE for more information.
-#
-
-include $(TOPDIR)/rules.mk
-
-PKG_NAME:=libconfig
-PKG_VERSION:=1.7.2
-PKG_RELEASE:=2
-
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=https://hyperrealm.github.io/libconfig/dist/
-PKG_HASH:=7c3c7a9c73ff3302084386e96f903eb62ce06953bb1666235fac74363a16fad9
-
-PKG_FIXUP:=autoreconf
-PKG_INSTALL:=1
-
-PKG_MAINTAINER:=Felix Fietkau <nbd@nbd.name>
-PKG_LICENSE:=LGPL-2.1+
-
-include $(INCLUDE_DIR)/package.mk
-
-define Package/libconfig
-  SECTION:=libs
-  CATEGORY:=Libraries
-  TITLE:=Configuration File Library
-  URL:=http://www.hyperrealm.com/libconfig/
-  ABI_VERSION:=11
-endef
-
-define Package/libconfig/description
- Libconfig is a simple library for manipulating structured configuration
- files. This file format is more compact and more readable than XML. And
- unlike XML, it is type-aware, so it is not necessary to do string
- parsing in application code.
-
- Libconfig is very compact -- just 38K for the stripped C shared
- library (less than one-fourth the size of the expat XML parser library)
- and 66K for the stripped C++ shared library. This makes it well-suited
- for memory-constrained systems like handheld devices.
-endef
-
-CONFIGURE_ARGS += \
-	--enable-shared \
-	--disable-static \
-	--disable-cxx
-
-define Build/InstallDev
-	$(CP) $(PKG_INSTALL_DIR)/* $(1)/
-endef
-
-define Package/libconfig/install
-	$(INSTALL_DIR) $(1)/usr/lib
-	$(CP) $(PKG_INSTALL_DIR)/usr/lib/libconfig.so.* $(1)/usr/lib/
-endef
-
-$(eval $(call BuildPackage,libconfig))