Setup for cross-platform development and support #4
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* Import compiler builtin crate to fix issue with _umod and _udiv * Trim unnecessary Makefile variables and flags * Keep the BLOCK and ALIGN commands in linker.ld for now * Fix linking error `undefiend reference to rust_begin_unwind` * `panic_fmt` was mangled through optimization * `panic_fmt` becomes `rust_begin_unwind` * Solution: add `#[no_mangle]` before `panic_fmt` * [Rust Issue](rust-lang/rust#38281)
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_umodand_udivcould not be foundcompiler_builtinscrateundefined reference to rust_begin_unwind#[no_mangle]beforepanic_fmtrust_begin_unwindrequired for panic=abort rust-lang/rust#38281