Install doesn't install header files

On Windows, install only installs everything except the header files. In CMakeLists.txt, the install is set up like this:

```

  # Install the library and headers.

  install(TARGETS ${INSTALL_TARGETS} EXPORT ${targets_export_name}

          LIBRARY DESTINATION ${FMT_LIB_DIR}

          ARCHIVE DESTINATION ${FMT_LIB_DIR}

          PUBLIC_HEADER DESTINATION "${FMT_INC_DIR}/fmt"

          RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})

```

But nowhere else are the header files marked "PUBLIC_HEADER".



Adding

```

set_property(TARGET fmt PROPERTY PUBLIC_HEADER ${FMT_HEADERS})

```

in line 289 right after

```

add_library(fmt::fmt ALIAS fmt)

```

does just that. But cmake is not my strongest suit.



Best Regards,

Mathias

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