Disable installer path modification

This is not likely to be usable to many people, and people who it *is*
useful for are knowledgeable enough to modify it themselves.  Most users
get no use at all and it most likely just confuses them instead.

cmake/win32_installer_deps.cmake

@@ -55,6 +55,5 @@ set(CPACK_NSIS_EXTRA_INSTALL_COMMANDS "${_extra_install}")
 set(CPACK_NSIS_EXTRA_UNINSTALL_COMMANDS "${_extra_uninstall}")
 set(CPACK_NSIS_CREATE_ICONS_EXTRA "${_extra_create_icons}")
 set(CPACK_NSIS_DELETE_ICONS_EXTRA "${_extra_delete_icons}")
-set(CPACK_NSIS_MODIFY_PATH ON)
 
 set(CPACK_NSIS_COMPRESSOR "/SOLID lzma")