fix: enable 3 more Windows E2E tests

- xlings.cppm: fix >/dev/null → >/dev/null in config_set_mirror on Windows
- 02_new_build_run: remove fresh-sandbox tag (uses global MCPP_HOME)
- 38_self_config_mirror: remove unix-shell tag (portable after >/dev/null fix)

With scan-deps now in xlings LLVM Windows package, test 16 should
also auto-enable via capability detection.

Author: Sunrisepeak

src/xlings.cppm

@@ -781,7 +781,11 @@ int config_set_mirror(const Env& env, std::string_view mirror, bool quiet) {
         "{} config --mirror {} {}",
         build_command_prefix(env),
         shq(mirror),
+#if defined(_WIN32)
+        quiet ? ">nul 2>&1" : "");
+#else
         quiet ? ">/dev/null 2>&1" : "");
+#endif
     return std::system(cmd.c_str());
 }
 

tests/e2e/02_new_build_run.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# requires: fresh-sandbox
+# requires:
 # Single-module hello world: mcpp new → build → run
 set -e
 

tests/e2e/38_self_config_mirror.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/env bash
-# requires: unix-shell
+# requires:
 # 38_self_config_mirror.sh — configure xlings mirror through mcpp self config.
 set -e