Merge #310

310: Only emit link_section for cortex-m r=jonas-schievink a=adamgreig

Previously we always emitted `link_section`, even though it only had an
effect when our linker script was being used (and only made sense on
cortex-m targets). This breaks building the code for a MacOS target,
which is occasionally useful for running `cargo check` etc.

In the macros crate we don't have the target information available, so
instead we continue to emit `link_section` except specifically on MacOS.

This keeps the fix from #306 but hopefully resolves the confusion in https://github.com/rust-embedded/cortex-m-rt/issues/74#issuecomment-768079657.

Co-authored-by: Adam Greig <adam@adamgreig.com>

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