Remove unused `SYCL_INCLUDE_DIR` hint #271

Job	Run time
build_linux (3.9)	2m 32s
build_linux (3.10)	2m 17s
build_linux (3.11)	2m 58s
build_linux (3.12)	2m 31s
build_windows (3.9)	24m 22s
build_windows (3.10)	18m 41s
build_windows (3.11)	15m 24s
build_windows (3.12)	18m 44s
test_linux (3.9, false, ubuntu-latest)	1m 14s
test_linux (3.10, false, ubuntu-latest)	1m 28s
test_linux (3.11, false, ubuntu-latest)	1m 25s
test_linux (3.12, false, ubuntu-latest)	1m 35s
test_windows (3.9, false, windows-2019)	3m 8s
test_windows (3.10, false, windows-2019)	3m 59s
test_windows (3.11, false, windows-2019)	3m 44s
test_windows (3.12, false, windows-2019)	2m 42s
	1h 46m 44s

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