CI-mingw

Fix #686: Add warning for bad line directives #317

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Run time

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Job	Run time
build (g++, MINGW64)	3m 28s
build (g++, MINGW32)	3m 50s
build (clang++, MINGW64)	2m 55s
build (clang++, CLANG64)	3m 24s
	13m 37s