Merge branch 'Werror'

* Werror:
  test: ignore -Walloc-size-larger-than error for calloc() returns ENOMEM
  Fix EVBASE_ACQUIRE_LOCK/EVBASE_RELEASE_LOCK for EVENT__DISABLE_THREAD_SUPPORT
  http: suppress "flags may be used uninitialized in this function" error
  Detech -Wno-unused-functions for GCC too
  cmake: add compiler version to the status message
  Fix BEV_LOCK/BEV_UNLOCK macros for EVENT__DISABLE_THREAD_SUPPORT
  Run builds with -Werror on CI for linux
  Fix -Werror for autotools
  Add -Wundef for cmake and fix EVENT__SIZEOF_TIME_T usage