LLVM/clang is not used for any compilation due to it not supporting the
8-bit architectures we use (MCS-51, AVR). This means we are effectively
installing 250+ MiB of dependencies for a C formatting tool.
Replace it with uncrustify, which uses only ~600 KiB of space and has
more granular control of formatting (800+ options).
Signed-off-by: Tim Crawford <tcrawford@system76.com>
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