Upgrade obstack to gcc-12.2.0 am: 6705a37140

Original change: https://android-review.googlesource.com/c/platform/external/obstack/+/2243174

Change-Id: I5b8b1722e0cf8ecf50a138f0ae2b29b9f5b44d7d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>