libowfat: fix a build error (havescope.h)

this fixes #63

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@free.fr>

libs/libowfat/patches/001-fixbuild.patch

@@ -0,0 +1,11 @@
+--- a/GNUmakefile
++++ b/GNUmakefile
+@@ -278,6 +278,8 @@ socket_accept4.o socket_accept6.o socket
+ socket_local6.o socket_recv4.o socket_recv6.o socket_remote4.o \
+ socket_remote6.o: havesl.h
+ 
++socket_remote4.o: havescope.h
++
+ dns_nd6.o fmt_xlong.o scan_xlong.o fmt_ip6_flat.o $(TEXTCODE_OBJS): haveinline.h
+ 
+ iob_send.o scan_ip6if.o: havealloca.h