[socket] Set CLOEXEC flag for fd in android_get_control_socket() am: 1569a26f0a am: 88523caf40 am: 3399231b61 am: babb5970ec am: 315c3d57fa am: b61a7ca964

Original change: https://android-review.googlesource.com/c/platform/system/librustutils/+/2615173

Change-Id: Id9a7b7c16b8b3c13e1db58b1315c58a40c56c15f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>