Fix hpp-fclConfig.cmake on Windows #13

Job	Run time
ubuntu-latest - Env all Release	5m 22s
ubuntu-latest - Env all Release -mavx2	5m 33s
ubuntu-latest - Env all Debug	32m 52s
ubuntu-latest - Env all Debug -mavx2	32m 26s
ubuntu-latest - Env all-py39 Release	5m 29s
ubuntu-latest - Env all-py39 Release -mavx2	5m 21s
ubuntu-latest - Env all-py39 Debug	32m 46s
ubuntu-latest - Env all-py39 Debug -mavx2	32m 33s
macos-latest - Env all Release	11m 48s
macos-latest - Env all Debug	21m 53s
macos-latest - Env all-py39 Release	5m 39s
macos-latest - Env all-py39 Debug	16m 55s
macos-13 - Env all Release	20m 14s
macos-13 - Env all Debug	50m 5s
macos-13 - Env all-py39 Release	12m 16s
macos-13 - Env all-py39 Debug	34m 50s
windows-latest - Env all Release	27m 14s
windows-latest - Env all-clang-cl Release	8m 32s
check-macos-linux-windows-pixi	2s
	6h 1m 50s

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