aya-obj: migrate bindgen destination

Aya::obj depends on bindgen generated files, and we start
by migrating bindgen generated files.

This commit adds the new aya-obj crate to the workplace
and migrates generated files into the crate. We use core
instead of std in an effort to make the final crate no_std.

Bindgen was run against libbpf v1.0.1.

Refs: #473

Cargo.toml

@@ -1,12 +1,12 @@
 [workspace]
 members = [
-    "aya", "aya-tool", "aya-log", "aya-log-common", "aya-log-parser", "test/integration-test", "test/integration-test-macros", "xtask",
+    "aya", "aya-obj", "aya-tool", "aya-log", "aya-log-common", "aya-log-parser", "test/integration-test", "test/integration-test-macros", "xtask",
     # macros
     "aya-bpf-macros", "aya-log-ebpf-macros",
     # ebpf crates
     "bpf/aya-bpf", "bpf/aya-bpf-bindings", "bpf/aya-log-ebpf", "test/integration-ebpf"
 ]
-default-members = ["aya", "aya-tool", "aya-log", "aya-bpf-macros", "aya-log-ebpf-macros"]
+default-members = ["aya", "aya-obj", "aya-tool", "aya-log", "aya-bpf-macros", "aya-log-ebpf-macros"]
 
 [profile.dev]
 panic = "abort"

aya-obj/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "aya-obj"
+version = "0.11.0"
+description = "A library for loading and relocating eBPF object files"
+keywords = ["ebpf", "bpf", "linux", "kernel"]
+license = "MIT OR Apache-2.0"
+authors = ["The Aya Contributors"]
+repository = "https://github.com/aya-rs/aya"
+readme = "README.md"
+documentation = "https://docs.rs/aya-obj"
+edition = "2021"
+
+[dependencies]

aya-obj/README.md

@@ -0,0 +1 @@
+# aya-obj

aya/src/generated/btf_internal_bindings.rs → aya-obj/src/generated/btf_internal_bindings.rs

@@ -1,10 +1,10 @@
-/* automatically generated by rust-bindgen 0.60.1 */
+/* automatically generated by rust-bindgen 0.63.0 */
 
-pub type __u8 = ::std::os::raw::c_uchar;
-pub type __u16 = ::std::os::raw::c_ushort;
-pub type __u32 = ::std::os::raw::c_uint;
+pub type __u8 = ::core::ffi::c_uchar;
+pub type __u16 = ::core::ffi::c_ushort;
+pub type __u32 = ::core::ffi::c_uint;
 pub mod bpf_core_relo_kind {
-    pub type Type = ::std::os::raw::c_uint;
+    pub type Type = ::core::ffi::c_uint;
     pub const BPF_CORE_FIELD_BYTE_OFFSET: Type = 0;
     pub const BPF_CORE_FIELD_BYTE_SIZE: Type = 1;
     pub const BPF_CORE_FIELD_EXISTS: Type = 2;