This avoids relying on Android 5.0 / API level 21. The Linux kernel used
by Android supports the syscall (except in truly ancient Android
versions), but the Android libc did not expose a wrapper.

Adding dl_iterate_phdr function and related structs and types to the
uclibc module as per the file include/link.h found in the uClibc-ng
repository as of version 1.0.36. This is necessary in order for rust to
work with a new target armv7-unknown-linux-uclibceabihf.

Co-authored-by: Yuki Okushi <huyuumi.dev@gmail.com>

Signed-off-by: Kenta Tada <Kenta.Tada@sony.com>

Reference:
https://github.com/aosp-mirror/platform_bionic/blob/master/libc/include/bits/lockf.h#L39-L46

We leave IPPROTO_MAX as is for the time being. However, in recent
kernel releases IPPROTO_MAX is actually higher and reflects the
addition of IPPROTO_MPTCP.

Signed-off-by: Kenta Tada <Kenta.Tada@sony.com>

From sys/uio.h. Note that preadv64/pwritev64 are already included in
src/unix/linux_like/mod.rs.
Also fix parameter names of process_vm_[readv,writev] to match Bionic
header.