Merge pull request #253 from rustylocker/fix-unused-warnings #640

Job	Run time
CmakeBuild	22s
MakeBuild	16s
Python	13s
CheckPatch	7s
Test	1m 22s
PlatformIO (examples/platformio/pd.ino)	23s
DocBuild	35s
PlatformIO (examples/platformio/cp.ino)	26s
	3m 44s

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