toolchain/musl: add support for renameat2()
Backport an upstream patch to support the renameat2 syscall, added in Linux
3.15 and supported by glibc since 2.28. It is commonly used in filesystem
or security contexts, and needed building upstream kernel bpf selftests.
Link:
https://inbox.vuxu.org/musl/
20240421153640.379015-1-Tony.Ambardar@gmail.com/
Signed-off-by: Tony Ambardar <itugrok@yahoo.com>
Link: https://github.com/openwrt/openwrt/pull/15697
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>