Fix hpp-fclConfig.cmake on Windows #17

Job	Run time
ubuntu-latest - Env all Release	5m 23s
ubuntu-latest - Env all Release -mavx2	17m 29s
ubuntu-latest - Env all Debug	32m 27s
ubuntu-latest - Env all Debug -mavx2	43m 48s
ubuntu-latest - Env all-py39 Release	5m 19s
ubuntu-latest - Env all-py39 Release -mavx2	5m 29s
ubuntu-latest - Env all-py39 Debug	32m 59s
ubuntu-latest - Env all-py39 Debug -mavx2	32m 26s
macos-latest - Env all Release	12m 53s
macos-latest - Env all Debug	17m 59s
macos-latest - Env all-py39 Release	4m 59s
macos-latest - Env all-py39 Debug	18m 35s
macos-13 - Env all Release	27m 1s
macos-13 - Env all Debug	39m 32s
macos-13 - Env all-py39 Release	10m 56s
macos-13 - Env all-py39 Debug	36m 3s
windows-latest - Env all Release	9m 24s
windows-latest - Env all-clang-cl Release	9m 25s
check-macos-linux-windows-pixi	3s
	6h 2m 10s

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