Import xl2tpd

Use sources on github and add myself as maintainer.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

net/xl2tpd/patches/100-makefile_opt_flags.patch

@@ -0,0 +1,12 @@
+--- a/Makefile
++++ b/Makefile
+@@ -91,7 +91,8 @@ OSFLAGS+= -DUSE_KERNEL
+ 
+ IPFLAGS?= -DIP_ALLOCATION
+ 
+-CFLAGS+= $(DFLAGS) -O2 -fno-builtin -Wall -DSANITY $(OSFLAGS) $(IPFLAGS)
++OFLAGS=-O2
++CFLAGS+= $(DFLAGS) $(OFLAGS) -fno-builtin -Wall -DSANITY $(OSFLAGS) $(IPFLAGS)
+ HDRS=l2tp.h avp.h misc.h control.h call.h scheduler.h file.h aaa.h md5.h
+ OBJS=xl2tpd.o pty.o misc.o control.o avp.o call.o network.o avpsend.o scheduler.o file.o aaa.o md5.o
+ SRCS=${OBJS:.o=.c} ${HDRS}