GHC_FILESYSTEM_WITH_INSTALL always on

[DioEgizio]

https://github.com/gulrak/filesystem#git-submodule-and-cmake says it should be off when used as a submodule, but it's actually always on :p

filesystem/CMakeLists.txt

Line 18 in cd6805e

 option(GHC_FILESYSTEM_WITH_INSTALL "With install target" ON) 

[Steffen Schümann]

I'll look into it.

[Steffen Schümann]

Released with v1.5.14.