Bump third_party/pigweed/repo from `ce0e3e2` to `1c771e0` #1047

Job	Run time
Build on Darwin (clang, simulated)	57m 22s
Build on Linux (coverage)	12m 56s
Build on Linux (fake, gcc_release, clang, simulated)	52m 48s
Build on Linux (gcc_debug)	1h 4m 58s
Build on Linux (python_lib)	22m 47s
Build on Linux (python lighting-app)	6m 54s
	3h 37m 45s

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