plugin/libplugin: API for C plugins.

Doesn't do logging yet.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

plugins/Makefile

@@ -0,0 +1,37 @@
+PLUGIN_LIB_SRC := plugins/libplugin.c
+PLUGIN_LIB_HEADER := plugins/libplugin.h
+PLUGIN_LIB_OBJS := $(PLUGIN_LIB_SRC:.c=.o)
+
+PLUGIN_COMMON_OBJS :=				\
+	bitcoin/chainparams.o			\
+	bitcoin/pubkey.o			\
+	bitcoin/pullpush.o			\
+	bitcoin/script.o			\
+	bitcoin/shadouble.o			\
+	bitcoin/short_channel_id.o		\
+	bitcoin/signature.o			\
+	bitcoin/tx.o				\
+	bitcoin/varint.o			\
+	common/bech32.o				\
+	common/bech32_util.o			\
+	common/bolt11.o				\
+	common/daemon.o				\
+	common/hash_u5.o			\
+	common/json.o				\
+	common/json_escaped.o			\
+	common/json_tok.o			\
+	common/memleak.o			\
+	common/param.o				\
+	common/type_to_string.o			\
+	common/utils.o				\
+	common/version.o			\
+	wire/fromwire.o				\
+	wire/towire.o
+
+# Make sure these depend on everything.
+ALL_OBJS += $(PLUGIN_LIB_OBJS)
+
+clean: plugin-clean
+
+plugin-clean:
+	$(RM) $(PLUGIN_LIB_OBJS)