Proposal: Makefile: Deal with Windows

[LRitzdorf]

Description

It is possible to install GNU make on Windows.

Currently, our Makefile is untested on Windows, and is likely to misbehave at best. We can try to detect the current OS, and react as we deem appropriate.

Solution

Windows OS detection can apparently be accomplished with:

ifeq ($(OS),Windows_NT)
	@echo 'Do stuff here...'
endif

If we detect that we are running on Windows, we have two main options:

1. Return an error message and exit
   • Plugin managers are, in my experience, quite usable on Windows, with proper configuration, so we might recommend this in our message
2. Change the appropriate paths and install anyway
   • I believe this also changes depending on whether Vim or Neovim is in use
   • Higher complexity

I personally feel that the first option is perfectly acceptable, since anyone who's running Vim and Make on Windows should be comfortable configuring things themselves.

Code of Conduct

• I agree to follow this project's Code of Conduct.

[l-zeuch]

+1 on recommending a plugin manager in case of installing on Windows, everything else is rather weird to handle, already took a look into it and (Neo)vim files can be in several locations for one user...