Fix hpp-fclConfig.cmake on Windows #11

Job	Run time
ubuntu-latest - Env all Release	5m 20s
ubuntu-latest - Env all Release -mavx2	5m 28s
ubuntu-latest - Env all Debug	19m 6s
ubuntu-latest - Env all Debug -mavx2	19m 6s
ubuntu-latest - Env all-py39 Release	5m 30s
ubuntu-latest - Env all-py39 Release -mavx2	5m 22s
ubuntu-latest - Env all-py39 Debug	13m 39s
ubuntu-latest - Env all-py39 Debug -mavx2	19m 7s
macos-latest - Env all Release	1s
macos-latest - Env all Debug	5m 36s
macos-latest - Env all-py39 Release	1s
macos-latest - Env all-py39 Debug	1s
macos-13 - Env all Release	11m 17s
macos-13 - Env all Debug	19m 12s
macos-13 - Env all-py39 Release	10m 57s
macos-13 - Env all-py39 Debug	10m 54s
windows-latest - Env all Release	13m 16s
windows-latest - Env all-clang-cl Release	9m 22s
check-macos-linux-windows-pixi	1s
	2h 53m 16s

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