add anoia.net.constants for SOCK_{STREAM,DGRAM} etc

we use an ugly bit of C preprocessor to get the values from
header files, because certain constants are different on MIPS
than on other architectures

pkgs/anoia/Makefile

@@ -1,10 +1,14 @@
 
-default: fs.lua init.lua nl.lua svc.lua
+default: fs.lua init.lua nl.lua svc.lua net/constants.lua
 
 test:
 	ln -s . anoia
 	fennel test.fnl
 	fennel test-svc.fnl
 
+net/constants.lua: net/constants.c
+	$(CC) -imacros sys/socket.h -imacros linux/netlink.h -E -P - < net/constants.c  | sed 's/ *$$//g' | cat -s > net/constants.lua
+
+
 %.lua: %.fnl
 	fennel --compile $< > $@