cmd/internal/buildid: don't crash on 0 phdr.p_align field
A 0 in phdr.p_align is the same as 1, meaning no alignment.
Fixes #62097
Change-Id: I931bab443fd6a89b5b45c8f99ead217f02e9b453
Reviewed-on: https://go-review.googlesource.com/c/go/+/520597
Auto-Submit: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com> Reviewed-by: Bryan Mills <bcmills@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>