rp-pppoe: use pppoe.so instead of rp-pppoe.so

Signed-off-by: Jianhui Zhao <zhaojh329@gmail.com>

net/rp-pppoe/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=rp-pppoe
 PKG_VERSION:=3.14
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://dianne.skoll.ca/projects/rp-pppoe/download
@@ -106,7 +106,7 @@ endef
 TARGET_CFLAGS += -I$(PKG_BUILD_DIR)/src/libevent -isystem $(PKG_BUILD_DIR)/missing-headers -D_BSD_SOURCE
 CONFIGURE_PATH := ./src
 CONFIGURE_ARGS += ac_cv_path_PPPD=/usr/sbin/pppd --enable-plugin=$(STAGING_DIR)/usr/include/
-MAKE_FLAGS := DESTDIR="$(PKG_INSTALL_DIR)" PLUGIN_PATH=rp-pppoe.so install
+MAKE_FLAGS := DESTDIR="$(PKG_INSTALL_DIR)" PLUGIN_PATH=pppoe.so install
 MAKE_PATH := ./src
 
 define Build/Prepare