Fix prelude to use IBF

Since universal-parser and prism support, prelude code used functions
inaccessible from outside libruby shared library.

```
linking goruby
/usr/bin/ld: goruby.o: in function `prelude_eval':
/home/runner/work/ruby/ruby/build/golf_prelude.c:221: undefined reference to `rb_ruby_prism_ptr'
/usr/bin/ld: goruby.o: in function `pm_prelude_load':
/home/runner/work/ruby/ruby/build/golf_prelude.c:192: undefined reference to `pm_options_line_set'
/usr/bin/ld: /home/runner/work/ruby/ruby/build/golf_prelude.c:193: undefined reference to `pm_parse_string'
/usr/bin/ld: goruby.o: in function `prelude_eval':
/home/runner/work/ruby/ruby/build/golf_prelude.c:224: undefined reference to `pm_iseq_new_with_opt'
/usr/bin/ld: /home/runner/work/ruby/ruby/build/golf_prelude.c:226: undefined reference to `pm_parse_result_free'
/usr/bin/ld: goruby.o: in function `prelude_ast_value':
/home/runner/work/ruby/ruby/build/golf_prelude.c:181: undefined reference to `rb_ruby_ast_data_get'
/usr/bin/ld: goruby.o: in function `prelude_eval':
/home/runner/work/ruby/ruby/build/golf_prelude.c:231: undefined reference to `rb_ruby_ast_data_get'
/usr/bin/ld: goruby.o: in function `pm_prelude_load':
/home/runner/work/ruby/ruby/build/golf_prelude.c:196: undefined reference to `pm_parse_result_free'
collect2: error: ld returned 1 exit status
```

1 files changed, 3 insertions, 4 deletions

diff --git a/goruby.c b/goruby.c
index 5d45277207..310bac5393 100644
--- a/goruby.c
+++ b/goruby.c
@@ -1,4 +1,4 @@
-static void Init_golf(void);
+static void Init_golf_prelude(void);
 static void *goruby_options(int argc, char **argv);
 static int goruby_run_node(void *arg);
 #define ruby_options goruby_options
@@ -17,14 +17,13 @@ static int goruby_run_node(void *arg);
 
 RUBY_EXTERN void *ruby_options(int argc, char **argv);
 RUBY_EXTERN int ruby_run_node(void*);
-RUBY_EXTERN void ruby_init_ext(const char *name, void (*init)(void));
 
-#include "golf_prelude.c"
+#include "golf_prelude.rbbin"
 
 static VALUE
 init_golf(VALUE arg)
 {
-    Init_golf();
+    Init_golf_prelude();
     rb_provide("golf.so");
     return arg;
 }