-Wabi warnings when compiling with GCC 8
Compiling GnuTLS with GCC 8.1 (Debian testing) results in the build log flooded with the following warning messages:
cc1: warning: -Wabi won't warn about anything [-Wabi]
cc1: note: -Wabi warns about differences from the most up-to-date ABI, which is also used by default
cc1: note: use e.g. -Wabi=11 to warn about changes from GCC 7