Makefile: make sure ALL_PROGRAMS doesn't include cln-grpc plugin.

$(ALL_PROGRAMS) are assumed to be C programs for now.

Add $(C_PLUGINS) as a new variable.

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

plugins/Makefile

@@ -75,7 +75,7 @@ PLUGIN_ALL_HEADER :=				\
 	$(PLUGIN_SPENDER_HEADER)
 PLUGIN_ALL_OBJS := $(PLUGIN_ALL_SRC:.c=.o)
 
-PLUGINS :=					\
+C_PLUGINS :=					\
 	plugins/autoclean			\
 	plugins/bcli				\
 	plugins/fetchinvoice			\
@@ -87,10 +87,22 @@ PLUGINS :=					\
 	plugins/txprepare			\
 	plugins/spenderp
 
+PLUGINS := $(C_PLUGINS)
+
+ifneq ($(RUST),0)
+# Builtin plugins must be in this plugins dir to work when we're executed
+# *without* make install.
+plugins/cln-grpc: target/${RUST_PROFILE}/cln-grpc
+	@cp $< $@
+
+DEFAULT_TARGETS += $(CLN_PLUGIN_EXAMPLES) plugins/cln-grpc
+PLUGINS += plugins/cln-grpc
+endif
+
 # Make sure these depend on everything.
 ALL_C_SOURCES += $(PLUGIN_ALL_SRC)
 ALL_C_HEADERS += $(PLUGIN_ALL_HEADER)
-ALL_PROGRAMS += $(PLUGINS)
+ALL_PROGRAMS += $(C_PLUGINS)
 
 PLUGIN_COMMON_OBJS :=				\
 	bitcoin/base58.o			\
@@ -168,16 +180,6 @@ plugins/fetchinvoice: bitcoin/chainparams.o $(PLUGIN_FETCHINVOICE_OBJS) $(PLUGIN
 
 plugins/funder: bitcoin/chainparams.o bitcoin/psbt.o common/psbt_open.o $(PLUGIN_FUNDER_OBJS) $(PLUGIN_LIB_OBJS) $(PLUGIN_COMMON_OBJS) $(JSMN_OBJS) $(CCAN_OBJS)
 
-ifneq ($(RUST),0)
-# Builtin plugins must be in this plugins dir to work when we're executed
-# *without* make install.
-plugins/cln-grpc: target/${RUST_PROFILE}/cln-grpc
-	@cp $< $@
-
-DEFAULT_TARGETS += $(CLN_PLUGIN_EXAMPLES) plugins/cln-grpc
-PLUGINS += plugins/cln-grpc
-endif
-
 # Generated from PLUGINS definition in plugins/Makefile
 ALL_C_HEADERS += plugins/list_of_builtin_plugins_gen.h
 plugins/list_of_builtin_plugins_gen.h: plugins/Makefile Makefile