internal/xcoff: use unsigned integers in file structs to avoid negative values
Fixes #58137
Updates #54584
Change-Id: Ifeee1be22051b842e0707d1907dbfa58bfeb336b
GitHub-Last-Rev:
9768e7c4a4954824fa1a2c41c0ad72e496408f91
GitHub-Pull-Request: golang/go#58164
Reviewed-on: https://go-review.googlesource.com/c/go/+/464336
Reviewed-by: Ayappan Perumal <ayappanec@gmail.com>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>