poprouting: Fix build with external toolchains

The Makefile would not consistently honour CFLAGS or LDFLAGS, and we
were not correctly setting them in the OpenWrt/LEDE Makefile either.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

poprouting/Makefile

@@ -2,7 +2,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=prince
 PKG_VERSION:=v0.3.1
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)
 PKG_USE_MIPS16:=0
@@ -33,6 +33,9 @@ the timer's value are optimized. Finally the timers are pushed back to the routi
 Currently it only supports OLSRd2 (aka OONF).
 endef
 
+CFLAGS += $(TARGET_CFLAGS) $(TARGET_CPPFLAGS)
+LDFLAGS += $(TARGET_LDFLAGS)
+
 define Package/prince/install
 	$(INSTALL_DIR) $(1)/usr/lib
 	$(INSTALL_DIR) $(1)/usr/sbin

poprouting/patches/001-cflags.patch

@@ -0,0 +1,27 @@
+From dda5c5a0cd2204816f2f83f18e7820ded6c962df Mon Sep 17 00:00:00 2001
+From: Florian Fainelli <f.fainelli@gmail.com>
+Date: Mon, 5 Jun 2017 17:30:24 -0700
+Subject: [PATCH] Honor CFLAGS and LDFLAGS when passed
+
+---
+ Makefile | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+Index: prince-v0.3.1/Makefile
+===================================================================
+--- prince-v0.3.1.orig/Makefile
++++ prince-v0.3.1/Makefile
+@@ -1,11 +1,11 @@
+ CFLAGS+=-lm -ldl -ljson-c -pthread
+ poprouting:out libs
+ 	cp prince/src/common_c.h prince/src/common.h
+-	$(CC) $(LDFLAGS) prince/src/prince.c prince/src/lib/ini.c prince/src/parser.c prince/src/socket.c graph-parser_c/src/brandes.c graph-parser_c/src/biconnected.c  graph-parser_c/src/graph_parser.c graph-parser_c/src/graph/graph.c graph-parser_c/src/graph/list.c graph-parser_c/src/network_change.c -o output/prince   $(CFLAGS)
++	$(CC) $(LDFLAGS) $(CFLAGS) prince/src/prince.c prince/src/lib/ini.c prince/src/parser.c prince/src/socket.c graph-parser_c/src/brandes.c graph-parser_c/src/biconnected.c  graph-parser_c/src/graph_parser.c graph-parser_c/src/graph/graph.c graph-parser_c/src/graph/list.c graph-parser_c/src/network_change.c -o output/prince
+ 	rm prince/src/common.h
+ libs:
+ 	cp prince/src/common_c.h prince/src/common.h
+-	$(CC) -shared -fPIC -o output/libprince_oonf_c.so prince/src/oonf.c prince/src/socket.c prince/src/parser.c graph-parser_c/src/brandes.c graph-parser_c/src/biconnected.c  graph-parser_c/src/graph_parser.c graph-parser_c/src/graph/graph.c graph-parser_c/src/graph/list.c graph-parser_c/src/network_change.c
++	$(CC) $(LDFLAGS) $(CFLAGS) -shared -fPIC -o output/libprince_oonf_c.so prince/src/oonf.c prince/src/socket.c prince/src/parser.c graph-parser_c/src/brandes.c graph-parser_c/src/biconnected.c  graph-parser_c/src/graph_parser.c graph-parser_c/src/graph/graph.c graph-parser_c/src/graph/list.c graph-parser_c/src/network_change.c
+ clean:
+ 	rm output/*
+