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2020-07-21lib/libm_dbl: Add round.c source code.Zoltán Vörös
This code is imported from musl, to match existing code in libm_dbl. The file is also added to the build in stm32/Makefile. It's not needed by the core code but, similar to c5cc64175be32cb1e4f3f1a249667bc9f5a12613, allows round() to be used by user C modules or board extensions.