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This includes:
2018-02-18 warnings: Add support for Objective C
2018-02-03 stdlib: Fix compilation error on OpenIndiana
* lib/gnulib.mk.in: Regenerate.
* lib/stdlib.in.h, m4/getloadavg.m4, m4/stdlib_h.m4, m4/warnings.m4:
Copy from gnulib.