logd: enable -Wextra

Also drop -Wall and -Werror since they're included by default now.

Test: build
Change-Id: Ib0f33d2f02e00aaf544cb0ce5acec5d8acaa8a81
3 files changed
tree: f8b6c1dd5d7f80af2a0c7e08c1f3d18c7c8789f4
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/