Fix Windows extension feature detection

Author: samuel-williams-shopify

.github/workflows/test.yaml

@@ -16,6 +16,7 @@ jobs:
         os:
           - ubuntu
           - macos
+          - windows
 
         ruby:
           - "3.3"

ext/extconf.rb

@@ -27,7 +27,24 @@
 	$LDFLAGS << " -fsanitize=address -fsanitize=undefined"
 end
 
-have_func("rb_tracearg_instruction_sequence", "ruby/debug.h")
+checking_for("rb_tracearg_instruction_sequence declaration") do
+	if try_link(<<~C, "", werror: true)
+		#include <ruby.h>
+		#include <ruby/debug.h>
+		
+		static VALUE (*rb_tracearg_instruction_sequence_pointer)(rb_trace_arg_t *) = rb_tracearg_instruction_sequence;
+		
+		int main(void)
+		{
+			return rb_tracearg_instruction_sequence_pointer == 0;
+		}
+	C
+		$defs << "-DHAVE_RB_TRACEARG_INSTRUCTION_SEQUENCE"
+		true
+	else
+		false
+	end
+end
 
 create_header