Remove unused -Wno-implicit-function-declaration. am: 9bbd42a638 am: cc78841c5b

Original change: https://android-review.googlesource.com/c/platform/external/liburing/+/3364251

Change-Id: I943a81063e39271441d9be3e40a6890431407787
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>