patch 8.2.3566: build failure on old systems when using nano timestamp Commit: https://github.com/vim/vim/commit/44db603f691b58a8531e8ff528e0a7ce644257b2 Author: Gary Johnson <garyjohn@spocom.com> Date: Thu Oct 28 20:49:06 2021 +0100 patch 8.2.3566: build failure on old systems when using nano timestamp Problem: Build failure on old systems when using nano timestamp. Solution: Define _BSD_SOURCE, _SVID_SOURCE and _DEFAULT_SOURCE. (Gary Johnson, closes #9054)