xl2tpd: fix building failure caused by pfc

Fixes openwrt/packages#10270

Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>

net/xl2tpd/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=xl2tpd
 PKG_VERSION:=1.3.15
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_MAINTAINER:=Yousong Zhou <yszhou4tech@gmail.com>
 PKG_LICENSE:=GPL-2.0
 PKG_LICENSE_FILES:=LICENSE
@@ -21,8 +21,6 @@ PKG_SOURCE_VERSION:=v$(PKG_VERSION)
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_MIRROR_HASH:=e12232fef216a1cb5b74f990616aff1dd851c62812ef54658a330629823c0996
 
-PKG_BUILD_DEPENDS:=libpcap
-
 PKG_INSTALL:=1
 
 include $(INCLUDE_DIR)/package.mk

net/xl2tpd/patches/0001-Skip-building-pfc.patch

@@ -0,0 +1,61 @@
+From 1d11b2432b6e0f99b9f08c65b51292e1a2251975 Mon Sep 17 00:00:00 2001
+From: Yousong Zhou <zhouyousong@yunionyun.com>
+Date: Fri, 18 Oct 2019 11:29:03 +0000
+Subject: [PATCH] Skip building pfc
+
+It can cause build failure, see [1]
+
+ [1] https://github.com/openwrt/packages/issues/10270
+---
+ Makefile | 15 +++------------
+ 1 file changed, 3 insertions(+), 12 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index 9927715..8a3eecd 100644
+--- a/Makefile
++++ b/Makefile
+@@ -115,10 +115,10 @@ BINDIR?=$(DESTDIR)${PREFIX}/bin
+ MANDIR?=$(DESTDIR)${PREFIX}/share/man
+ 
+ 
+-all: $(EXEC) pfc $(CONTROL_EXEC)
++all: $(EXEC) $(CONTROL_EXEC)
+ 
+ clean:
+-	rm -f $(OBJS) $(EXEC) pfc.o pfc $(CONTROL_EXEC)
++	rm -f $(OBJS) $(EXEC) $(CONTROL_EXEC)
+ 
+ $(EXEC): $(OBJS) $(HDRS)
+ 	$(CC) $(LDFLAGS) -o $@ $(OBJS) $(LDLIBS)
+@@ -126,10 +126,6 @@ $(EXEC): $(OBJS) $(HDRS)
+ $(CONTROL_EXEC): $(CONTROL_SRCS)
+ 	$(CC) $(CFLAGS) $(LDFLAGS) $(CONTROL_SRCS) -o $@
+ 
+-pfc:
+-	$(CC) $(CFLAGS) -c contrib/pfc.c
+-	$(CC) $(LDFLAGS) -o pfc pfc.o -lpcap $(LDLIBS)
+-
+ romfs:
+ 	$(ROMFSINST) /bin/$(EXEC)
+ 
+@@ -142,7 +138,7 @@ packagingprep:
+ 	sed -i "s/Version: .*/Version: ${XL2TPDBASEVERSION}/" packaging/*/*.spec
+ 	sed -i "s/PKG_VERSION:=.*/PKG_VERSION:=${XL2TPDBASEVERSION}/" packaging/openwrt/Makefile
+ 
+-install: ${EXEC} pfc ${CONTROL_EXEC}
++install: ${EXEC} ${CONTROL_EXEC}
+ 	install -d -m 0755 ${SBINDIR}
+ 	install -m 0755 $(EXEC) ${SBINDIR}/$(EXEC)
+ 	install -d -m 0755 ${MANDIR}/man5
+@@ -151,11 +147,6 @@ install: ${EXEC} pfc ${CONTROL_EXEC}
+ 	install -m 0644 doc/xl2tpd-control.8 ${MANDIR}/man8/
+ 	install -m 0644 doc/xl2tpd.conf.5 doc/l2tp-secrets.5 \
+ 		 ${MANDIR}/man5/
+-	# pfc
+-	install -d -m 0755 ${BINDIR}
+-	install -m 0755 pfc ${BINDIR}/pfc
+-	install -d -m 0755 ${MANDIR}/man1
+-	install -m 0644 contrib/pfc.1 ${MANDIR}/man1/
+ 	# control exec
+ 	install -d -m 0755 ${SBINDIR}
+ 	install -m 0755 $(CONTROL_EXEC) ${SBINDIR}/$(CONTROL_EXEC)