Auto merge of #3279 - GuillaumeGomez:docs-rs, r=JohnTitor

Generate documentation for all supported targets on docs.rs

<docs.rs> now supports the possibility to generate documentation for any target. Currently, to look at some docs, we still need to use https://rust-lang.github.io/libc/#platform-specific-documentation, which isn't great. I didn't remove the documentation generation from CI nor did I change the `README.md` link to documentations as I thought maybe it'd be better to keep them, but I can if you want?

Cargo.toml

@@ -17,6 +17,114 @@ Raw FFI bindings to platform libraries like libc.
 
 [package.metadata.docs.rs]
 features = ["const-extern-fn", "extra_traits"]
+default-target = "x86_64-unknown-linux-gnu"
+targets = [
+    "aarch64-linux-android",
+    "aarch64-pc-windows-msvc",
+    "aarch64-unknown-freebsd",
+    "aarch64-unknown-fuchsia",
+    "aarch64-unknown-hermit",
+    "aarch64-unknown-linux-gnu",
+    "aarch64-unknown-linux-musl",
+    "aarch64-unknown-netbsd",
+    "aarch64-unknown-openbsd",
+    "aarch64-wrs-vxworks",
+    "arm-linux-androideabi",
+    "arm-unknown-linux-gnueabi",
+    "arm-unknown-linux-gnueabihf",
+    "arm-unknown-linux-musleabi",
+    "arm-unknown-linux-musleabihf",
+    "armebv7r-none-eabi",
+    "armebv7r-none-eabihf",
+    "armv5te-unknown-linux-gnueabi",
+    "armv5te-unknown-linux-musleabi",
+    "armv7-linux-androideabi",
+    "armv7-unknown-linux-gnueabihf",
+    "armv7-unknown-linux-musleabihf",
+    "armv7-wrs-vxworks-eabihf",
+    "armv7r-none-eabi",
+    "armv7r-none-eabihf",
+    "hexagon-unknown-linux-musl",
+    "i586-pc-windows-msvc",
+    "i586-unknown-linux-gnu",
+    "i586-unknown-linux-musl",
+    "i686-linux-android",
+    "i686-pc-windows-gnu",
+    "i686-pc-windows-msvc",
+    "i686-pc-windows-msvc",
+    "i686-unknown-freebsd",
+    "i686-unknown-haiku",
+    "i686-unknown-linux-gnu",
+    "i686-unknown-linux-musl",
+    "i686-unknown-netbsd",
+    "i686-unknown-openbsd",
+    "i686-wrs-vxworks",
+    "mips-unknown-linux-gnu",
+    "mips-unknown-linux-musl",
+    "mips64-unknown-linux-gnuabi64",
+    "mips64-unknown-linux-muslabi64",
+    "mips64el-unknown-linux-gnuabi64",
+    "mips64el-unknown-linux-muslabi64",
+    "mipsel-sony-psp",
+    "mipsel-unknown-linux-gnu",
+    "mipsel-unknown-linux-musl",
+    "nvptx64-nvidia-cuda",
+    "powerpc-unknown-linux-gnu",
+    "powerpc-unknown-linux-gnuspe",
+    "powerpc-unknown-netbsd",
+    "powerpc-wrs-vxworks",
+    "powerpc-wrs-vxworks-spe",
+    "powerpc64-unknown-freebsd",
+    "powerpc64-unknown-linux-gnu",
+    "powerpc64-wrs-vxworks",
+    "powerpc64le-unknown-linux-gnu",
+    "riscv32gc-unknown-linux-gnu",
+    "riscv32i-unknown-none-elf",
+    "riscv32imac-unknown-none-elf",
+    "riscv32imc-unknown-none-elf",
+    "riscv64gc-unknown-freebsd",
+    "riscv64gc-unknown-linux-gnu",
+    "riscv64gc-unknown-linux-musl",
+    "riscv64gc-unknown-none-elf",
+    "riscv64imac-unknown-none-elf",
+    "s390x-unknown-linux-gnu",
+    "s390x-unknown-linux-musl",
+    "sparc-unknown-linux-gnu",
+    "sparc64-unknown-linux-gnu",
+    "sparc64-unknown-netbsd",
+    "sparcv9-sun-solaris",
+    "thumbv6m-none-eabi",
+    "thumbv7em-none-eabi",
+    "thumbv7em-none-eabihf",
+    "thumbv7m-none-eabi",
+    "thumbv7neon-linux-androideabi",
+    "thumbv7neon-unknown-linux-gnueabihf",
+    "wasm32-unknown-emscripten",
+    "wasm32-unknown-unknown",
+    "wasm32-wasi",
+    "x86_64-fortanix-unknown-sgx",
+    "x86_64-linux-android",
+    "x86_64-pc-solaris",
+    "x86_64-pc-windows-gnu",
+    "x86_64-pc-windows-gnu",
+    "x86_64-pc-windows-msvc",
+    "x86_64-pc-windows-msvc",
+    "x86_64-unknown-dragonfly",
+    "x86_64-unknown-freebsd",
+    "x86_64-unknown-fuchsia",
+    "x86_64-unknown-haiku",
+    "x86_64-unknown-hermit",
+    "x86_64-unknown-illumos",
+    "x86_64-unknown-l4re-uclibc",
+    "x86_64-unknown-linux-gnu",
+    "x86_64-unknown-linux-gnux32",
+    "x86_64-unknown-linux-musl",
+    "x86_64-unknown-netbsd",
+    "x86_64-unknown-openbsd",
+    "x86_64-unknown-redox",
+    "x86_64-wrs-vxworks"
+]
+cargo-args = ["-Zbuild-std"]
 
 [dependencies]
 rustc-std-workspace-core = { version = "1.0.0", optional = true }