Add few compiler warning flags to error #376

Job	Run time
binary (humble, main) / humble main	4m 48s
binary (humble, testing) / humble testing	4m 39s
binary (iron, main) / iron main	4m 45s
binary (iron, testing) / iron testing	4m 43s
binary (jazzy, main) / jazzy main	4m 45s
binary (rolling, main) / rolling main	4m 33s
binary (jazzy, testing) / jazzy testing	4m 42s
binary (rolling, testing) / rolling testing	4m 38s
	37m 33s

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