Uniformize package Makefile, move ipkg related files to ./ipkg

openwrt/package/haserl/Makefile

openwrt/package/haserl/ipkg/haserl.control

openwrt/package/libelf/Makefile

openwrt/package/libelf/ipkg/libelf.control

openwrt/package/libgcc/Makefile

openwrt/package/libgcc/ipkg/libgcc.control

openwrt/package/libnet/Config.in

openwrt/package/libnet/Makefile

openwrt/package/libnet/ipkg/libnet-dev/CONTROL/control

openwrt/package/libnet/ipkg/libnet.control

openwrt/package/libnet/ipkg/libnet/CONTROL/control

openwrt/package/libnet/ipkg/rules

openwrt/package/libnet/ipkg/version

openwrt/package/libpthread/Makefile

openwrt/package/libpthread/ipkg/libpthread.control

openwrt/package/mysql/Makefile

openwrt/package/mysql/ipkg/libmysqlclient.control

openwrt/package/ncurses/Makefile

openwrt/package/ncurses/ipkg/libncurses.control

openwrt/package/postgresql/Makefile