Prepare for upcoming Component Model adoption in js gem

* Rename the current bindgen directory to bindgen/legacy
* Merge witapi extension into js extension because they will be a single
  dso after the Component Model adoption.

Author: kateinoigakukun

packages/gems/js/ext/witapi/bindgen/rb-abi-guest.c renamed to packages/gems/js/ext/js/bindgen/legacy/rb-abi-guest.c

@@ -1,10 +1,11 @@
 link.filelist:
 	echo $(foreach obj,$(OBJS),$(abspath $(obj))) > $@
+	echo -mexec-model=reactor >> $@
 
 js.a: link.filelist
 
-js-core.o: $(srcdir)/bindgen/rb-js-abi-host.h
+js-core.o: $(srcdir)/bindgen/legacy/rb-js-abi-host.h
 
-bindgen/%.o: $(srcdir)/bindgen/%.c
+bindgen/legacy/%.o: $(srcdir)/bindgen/legacy/%.c
 	@mkdir -p "$(@D)"
-	$(CC) -c -I$(srcdir)/bindgen -o $@ $<
+	$(CC) -c -I$(srcdir)/bindgen/legacy -o $@ $<

packages/gems/js/ext/witapi/bindgen/rb-abi-guest.h renamed to packages/gems/js/ext/js/bindgen/legacy/rb-abi-guest.h

@@ -1,3 +1,3 @@
 require "mkmf"
-$objs = %w[js-core.o bindgen/rb-js-abi-host.o]
+$objs = %w[js-core.o witapi-core.o bindgen/legacy/rb-js-abi-host.o bindgen/legacy/rb-abi-guest.o]
 create_makefile("js")

packages/gems/js/ext/witapi/bindgen/rb-abi-guest.wit renamed to packages/gems/js/ext/js/bindgen/legacy/rb-abi-guest.wit

@@ -2,7 +2,7 @@
 
 #include "ruby.h"
 
-#include "bindgen/rb-js-abi-host.h"
+#include "bindgen/legacy/rb-js-abi-host.h"
 
 // MARK: - Ruby extension
 

packages/gems/js/ext/js/bindgen/rb-js-abi-host.c renamed to packages/gems/js/ext/js/bindgen/legacy/rb-js-abi-host.c

@@ -17,7 +17,7 @@ static VALUE rb_eval_string_value_protect(VALUE str, int *pstate) {
 
 #define TAG_NONE 0
 
-#include "bindgen/rb-abi-guest.h"
+#include "bindgen/legacy/rb-abi-guest.h"
 
 __attribute__((import_module("asyncify"), import_name("start_unwind"))) void
 asyncify_start_unwind(void *buf);