CI-mingw

got rid of some redundant code in `simplecpp::preprocess()` #149

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Run time

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Job	Run time
build (clang++, MINGW64)	2m 53s
build (g++, MINGW64)	2m 42s
build (clang++, CLANG64)	2m 19s
build (g++, MINGW32)	2m 15s
build (clang++, MINGW32)	2m 57s
	13m 6s