RCPP-64 Don't use symbolic links in include folder #91

Job	Run time
build (ubuntu-latest, Debug, True)	12m 9s
build (ubuntu-latest, Debug, False)	11m 33s
build (ubuntu-latest, Release, True)	9m 54s
build (ubuntu-latest, Release, False)	9m 24s
build (windows-latest, Debug, True)	21m 18s
build (windows-latest, Debug, False)	20m 42s
build (windows-latest, Release, True)	12m 46s
build (windows-latest, Release, False)	13m 19s
build (macos-latest, Debug, True)	7m 47s
build (macos-latest, Debug, False)	13m 44s
build (macos-latest, Release, True)	7m 14s
build (macos-latest, Release, False)	6m 34s
	2h 26m 24s

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