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

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

Change-Id: I65b37f24885d69c1d48b1a0e6fe8dab3a9c53186
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>