lang: ast: move unit-package parser state definition to c file

lang/ast/unit-package.c

@@ -1,10 +1,15 @@
 #include <blue/object/string.h>
+#include <ivy/lang/lex.h>
 #include <stdio.h>
-#include "unit-package.h"
 
 #include "ctx.h"
 #include "node.h"
 
+struct unit_package_parser_state {
+	struct parser_state s_base;
+	int s_prev_token;
+};
+
 static enum ivy_status parse_dot(struct ivy_parser *ctx, struct ivy_token *tok)
 {
 	struct unit_package_parser_state *state