protobuf: replace the constant 4294967295 with 0xFFFFFFFF in generated sources

This workarounds a compilation warning on ARM:

	packet-sock.pb-c.c: In function 'packet_sock_entry__init':
	packet-sock.pb-c.c:98:3: error: this decimal constant is unsigned only in ISO C90 [-Werror]
	packet-sock.pb-c.c: At top level:
	packet-sock.pb-c.c:318:1: error: this decimal constant is unsigned only in ISO C90 [-Werror]
Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

protobuf/Makefile

@@ -48,6 +48,7 @@ PROTO_OBJS	:= $(patsubst %.c,%.o,$(PROTO_SRCS))
 %.pb-c.c %.pb-c.h: %.proto
 	$(E) "  PROTOBUF "$@
 	$(Q) protoc-c --c_out=./ $<
+	$(Q) sed -i 's/4294967295/0xFFFFFFFF/g' $@ $(patsubst %c,%h,$@)
 
 %.o: %.c %.h
 	$(E) "  CC       "$@