Support for MSYS2

[augustjanse]

Is your feature request related to a problem? Please describe.

I run MSYS2 Vim on Windows. This plugin is not compatible with that.

Describe the solution you'd like

I would like for a compatible binary to be compiled and uploaded so install.sh can fetch that binary.

Describe alternatives you've considered

I could install a Windows distribution of Vim.

Additional context

I tried (naively) to download the Windows binary manually, but got this error message

[LC] Failed to convert ("/c/Users/example-user/git/example-project/example.tex") to Url

which I suppose is natural. Going by msys2/MINGW-packages#459 it might be as simple as building with MSYS2 GCC.