QTemporaryFile: Disable O_TMPFILE on Android

We require linkat(2) to materialize the file and that is (stupidly)
filtered. See 138d34b9c8 and QTBUG-64103.

Task-number: QTBUG-68344
Change-Id: I052407b777ec43f78378fffd152fd8822761b452
Reviewed-by: BogDan Vatra <bogdan@kdab.com>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>

src/corelib/configure.json

@@ -569,7 +569,8 @@
         },
         "linkat": {
             "label": "linkat()",
-            "autoDetect": "config.linux",
+            "comment": "Currently only used by QTemporaryFile; linkat() exists on Android, but hardlink creation fails due to security rules",
+            "autoDetect": "config.linux && !config.android",
             "condition": "tests.linkat",
             "output": [ "privateFeature" ]
         },