Add F_OFD_* constants

src/unix/linux_like/android/mod.rs

src/unix/linux_like/emscripten/mod.rs

src/unix/linux_like/linux/gnu/b32/mod.rs

src/unix/linux_like/linux/gnu/b32/sparc/mod.rs

src/unix/linux_like/linux/gnu/b64/aarch64/mod.rs

src/unix/linux_like/linux/gnu/b64/mips64/mod.rs

src/unix/linux_like/linux/gnu/b64/powerpc64/mod.rs

src/unix/linux_like/linux/gnu/b64/riscv64/mod.rs

src/unix/linux_like/linux/gnu/b64/s390x.rs

src/unix/linux_like/linux/gnu/b64/sparc64/mod.rs

src/unix/linux_like/linux/gnu/b64/x86_64/mod.rs

src/unix/linux_like/linux/musl/b32/arm/mod.rs

src/unix/linux_like/linux/musl/b32/mips/mod.rs

src/unix/linux_like/linux/musl/b32/powerpc.rs

src/unix/linux_like/linux/musl/b32/x86/mod.rs

src/unix/linux_like/linux/musl/b64/aarch64/mod.rs

src/unix/linux_like/linux/musl/b64/mips64.rs

src/unix/linux_like/linux/musl/b64/powerpc64.rs

src/unix/linux_like/linux/musl/b64/x86_64/mod.rs