Avoid undefined behaviour if uid_t/gid_t is signed.

This drops support for CentOS 7 because its GCC is too old
to support `__builtin_add_overflow`, and its EOL'ing in about
half a year anyway.

Fixes #143

1 files changed, 5 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 381601b..cf96956 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2023-11-10  Martin Pärtel <martin dot partel at gmail dot com>
+
+	* Fixed undefined behaviour on platforms where `uid_t` or `gid_t`
+	  is signed (issue #143, thanks @hartwork!)
+
 2023-11-09  Martin Pärtel <martin dot partel at gmail dot com>
 
 	* Support negative --{uid,gid}-offset (issue #142)