wire: update how experimental csv patches are managed

We used to append new patches to a single file. This caused
some problems and is a lot harder to cleanup later.

This patch moves the experimental patches to their own, individual
patch files, that are named for the current BOLTVERSION, which they're
taken from.

Also moves the current patchfile over to a 'gossipqueries' one,
as it already exists.

wire/Makefile

@@ -38,10 +38,10 @@ extract-bolt-csv: bolt-precheck
 	@echo '#include <wire/onion_defs.h>' > wire/extracted_onion_wire_csv
 	@$(BOLT_EXTRACT) $(LOCAL_BOLTDIR)/04*.md >> wire/extracted_onion_wire_csv
 
-# Explicit command to add diff of BOLT CSV's to an experimental_csv file
+# Explicit command to add patchfile for BOLT CSV's
 extract-experimental-bolt-csv: bolt-precheck
-	@$(BOLT_EXTRACT) $(LOCAL_BOLTDIR)/0[127]*.md | diff -u wire/extracted_peer_wire_csv - >>wire/extracted_peer_experimental_csv | if [ $$? -lt 0 ];then exit 1;fi
-	@{ echo '#include <wire/onion_defs.h>'; $(BOLT_EXTRACT) $(LOCAL_BOLTDIR)/04*.md; } | diff -u wire/extracted_onion_wire_csv - >>wire/extracted_onion_experimental_csv | if [ $$? -lt 0 ];then exit 1;fi
+	@$(BOLT_EXTRACT) $(LOCAL_BOLTDIR)/0[127]*.md | diff -u wire/extracted_peer_wire_csv - >wire/extracted_peer_experimental_$(BOLTVERSION) | if [ $$? -lt 0 ];then exit 1;fi
+	@{ echo '#include <wire/onion_defs.h>'; $(BOLT_EXTRACT) $(LOCAL_BOLTDIR)/04*.md; } | diff -u wire/extracted_onion_wire_csv - > wire/extracted_onion_experimental_$(BOLTVERSION) | if [ $$? -lt 0 ];then exit 1;fi
 
 wire/extracted_peer_experimental_csv:
 	@touch $@
@@ -50,11 +50,14 @@ wire/extracted_onion_experimental_csv:
 	@touch $@
 
 ifeq ($(EXPERIMENTAL_FEATURES),1)
-wire/gen_peer_wire_csv: wire/extracted_peer_experimental_csv wire/extracted_peer_wire_csv
-	@patch --silent -o $@ wire/extracted_peer_wire_csv $<
+EXPERIMENTAL_PEER_PATCHES := $(wildcard wire/extracted_peer_experimental_*)
+EXPERIMENTAL_ONION_PATCHES := $(wildcard wire/extracted_onion_experimental_*)
 
-wire/gen_onion_wire_csv: wire/extracted_onion_experimental_csv wire/extracted_onion_wire_csv
-	@patch --silent -o $@ wire/extracted_onion_wire_csv $<
+wire/gen_peer_wire_csv: wire/extracted_peer_wire_csv $(EXPERIMENTAL_PEER_PATCHES)
+	@set -e; trap "rm -f $@.$$$$" 0; cp $< $@.$$$$; for exp in $(EXPERIMENTAL_PEER_PATCHES); do patch --silent $@.$$$$ $$exp; done; mv $@.$$$$ $@
+
+wire/gen_onion_wire_csv: wire/extracted_onion_wire_csv $(EXPERIMENTAL_ONION_PATCHES)
+	@set -e; trap "rm -f $@.$$$$" 0; cp $< $@.$$$$; for exp in $(EXPERIMENTAL_ONION_PATCHES); do patch --silent $@.$$$$ $$exp; done; mv $@.$$$$ $@
 
 else # /* EXPERIMENTAL_FEATURES */
 wire/gen_peer_wire_csv: wire/extracted_peer_wire_csv