[ATfE] Cherry-pick newlib-nano changes into 20.x release branch #137
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See ARM-software/LLVM-embedded-toolchain-for-Arm#628 for context. This enables newlib-nano as a multilib. I didn't find any release scripts, so I don't know how to add it to the CI such that it also generates an overlay package for newlib-nano on release. Note: this also fixes an issue with the current newlib builds where they don't get built correctly for anything above ARMv6 as the `-march`, `-mfloat-abi` and `-mfpu` arguments weren't being passed on to the newlib compilation configuration. A little unsure why this hasn't popped up before...
Commit 23f1d75 included `$(LLVM_TOOLCHAIN_C_LIBRARY)`, which isn't valid cmake syntax – to interpolate a cmake variable you have to use braces, not parentheses. This led to a mysterious error from git fatal: cannot change to 'rev-parse': No such file or directory because once `${base_library}` is set to something that doesn't make sense, `git -C ${${base_library}_SOURCE_DIR} rev-parse HEAD` substitutes nothing at all for the source directory, and the command collapses to just `git -C rev-parse` which indeed interprets `rev-parse` as the directory to change into.
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This cherry-picks the following changes into the 20.x release branch: