Enable cc test (#14026)

test/js/bun/ffi/cc.test.ts

@@ -1,11 +1,10 @@
-import { describe, expect, it } from "bun:test";
+import { expect, it } from "bun:test";
+import { bunEnv, bunExe, isWindows } from "harness";
 import path from "path";
 
-import { bunExe, bunEnv, isCI } from "harness";
-
 // TODO: we need to install build-essential and apple SDK in CI.
 // it can't find includes. It can on machiens with that enabled.
-it.todoIf(isCI)("can run a .c file", () => {
+it.todoIf(isWindows)("can run a .c file", () => {
   const result = Bun.spawnSync({
     cmd: [bunExe(), path.join(__dirname, "cc-fixture.js")],
     cwd: __dirname,