Disabling netrw disables the spelling files download suggestion

[saccarosium]

$ nvim --version
NVIM v0.2.0
Build type: Release
Compilation: /usr/bin/cc -march=x86-64 -mtune=generic -O2 -pipe -fstack-protector-strong -Wconversion -DNVIM_MSGPACK_HAS_FLOAT32 -O2 -DNDEBUG -DDISABLE_LOG -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wvla -fstack-protector-strong -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -I/build/neovim/src/build/config -I/build/neovim/src/neovim-0.2.0/src -I/usr/include -I/usr/include -I/usr/include -I/usr/include -I/usr/include -I/usr/include -I/usr/include -I/build/neovim/src/build/src/nvim/auto -I/build/neovim/src/build/include
Compiled by builduser

Optional features included (+) or not (-): +acl   +iconv    +jemalloc +tui      
For differences from Vim, see :help vim-differences

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

• Vim (version: ) behaves differently? no
• Operating system/version: Arch Linux
• Terminal name/version ($TERM): rxvt-unicode-256color

Steps to reproduce

1. Put in init.vim:

let g:loaded_netrwPlugin = 1

Thus prevents loading netrw. In the help file, it is also suggested to let g:loaded_netrw = 1 as well but it is not nescesarry to prove the bug.

2. run nvim or vim:

nvim # or vim

3. run inside it:

set spell
set spelllang=he " Just for example..

Actual behaviour

{n,}vim don't suggest to download the spell files from public ftp server of vim.

Expected behaviour

downloading spell files from vim's public ftp server is suggested although netrw is disabled.

original issue: neovim/neovim#7189