keep doc install subdir on windows
On native windows, doc files are copied to the root of CMAKE_INSTALL_PREFIX which could pollute prefixes using a package manager.
I propose to keep the same dir by default, and allow to redefine it if necessary:
On native windows, doc files are copied to the root of CMAKE_INSTALL_PREFIX which could pollute prefixes using a package manager.
I propose to keep the same dir by default, and allow to redefine it if necessary: