fix: allow Lua C modules to be uninstalled on MSYS2 (#1756)

Fixes #1755.

Changes:

* the idea applied as a fix was mirrored from the changes of #1616, by setting

```
defaults.fs_use_modules = false
```

in a suitable place for MSYS2.

* the line

```
if platforms.windows and not platforms.msys2_mingw_w64 and hardcoded.WIN_TOOLS then
```

is meant to follow a MSYS2 patch https://github.com/msys2/MINGW-packages/blob/343eeab4f185847981c6b644d775ee98717b6231/mingw-w64-lua-luarocks/0001-luarocks_msys2_mingw_w64.patch#L57 that fixes previous issues for them.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/luarocks/core/cfg.lua b/src/luarocks/core/cfg.lua
index e9139a4e..8c2d7d79 100644
--- a/src/luarocks/core/cfg.lua
+++ b/src/luarocks/core/cfg.lua
@@ -813,11 +813,13 @@ function cfg.init(detected, warning)
 
    local defaults = make_defaults(cfg.lua_version, processor, platforms, cfg.home)
 
-   if platforms.windows and hardcoded.WIN_TOOLS then
+   if platforms.windows and not platforms.msys2_mingw_w64 and hardcoded.WIN_TOOLS then
       local tools = { "SEVENZ", "CP", "FIND", "LS", "MD5SUM", "WGET", }
       for _, tool in ipairs(tools) do
          defaults.variables[tool] = '"' .. dir.path(hardcoded.WIN_TOOLS, defaults.variables[tool] .. '.exe') .. '"'
       end
+   elseif platforms.msys2_mingw_w64 then
+      defaults.fs_use_modules = false
    else
       defaults.fs_use_modules = true
    end