test: remove package-wide import assumptions

test/wcc/data/r930_free_alloc/case.ww

@@ -1,7 +1,6 @@
 //ww:run
 // Runtime half of 930_free_noop_run.c free_alloc_roundtrip.
 package main;
-import rt;
 export fn main() i32 = {
 	let p: *i64 = alloc(11i64)!;
 	free(p);