efivar fails to build with mold linker, so it should
be opted out. I also added missing maintainer.
Signed-off-by: Oskari Rauta <oskari.rauta@gmail.com>
musl 1.2.4 deprecated legacy "LFS64" ("large file support") interfaces so
just having _GNU_SOURCE defined is not enough anymore.
Backport an upstream fix to replace these old data types.
Signed-off-by: Tianling Shen <cnsztl@immortalwrt.org>