fix: multiple include path support #2656

Job	Run time
Build source R package	5m 3s
Check windows-latest (release)	17m 55s
Coverage	4m 59s
Check macOS-latest (release)	15m 49s
Sanitizer	23m 54s
Check ubuntu-20.04 (release)	6m 0s
Check ubuntu-20.04 (devel)	6m 41s
Check ubuntu-20.04 (oldrel-1)	5m 53s
Check ubuntu-20.04 (oldrel-2)	6m 2s
Check ubuntu-20.04 (oldrel-3)	6m 3s
Check ubuntu-20.04 (oldrel-4)	6m 0s
	1h 44m 19s

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