feature: MSYS2 support on src/makefile

[luau-project]

Description

The changes in the src/makefile allows to build luasocket on MSYS2 shells with the compiler toolchain for each environment:

• mingw32
• mingw64
• ucrt64
• clang32
• clang64
• clangarm64

How to test the changes

Initial setup of tools (only once)

1. Go to https://www.msys2.org/, download the installer and install MSYS2;
2. Type ucrt64 on Windows start menu to open a MSYS2 shell for the ucrt64 environment listed above;
3. Update core system packages

   pacman -Syuu
   

4. Sync package database

   pacman -Syuu
   

5. Install useful linux tools, git, a C compiler and Lua 5.1:

   pacman -S --needed base-devel git mingw-w64-ucrt-x86_64-cc mingw-w64-ucrt-x86_64-lua51
   

6. Change to /tmp directory and clone my branch

   cd /tmp && git clone --branch=msys2-makefile https://github.com/luau-project/luasocket
   

7. Leave the shell opened for the test

Test

1. In the same shell above, build luasocket for ucrt64 environment:

   make -C luasocket/src PLAT=msys2ucrt64 LUAV=5.1 all
   

2. Install the library:

   make -C luasocket/src PLAT=msys2ucrt64 LUAV=5.1 install
   

3. Run a simple test

   lua5.1 luasocket/test/hello.lua
   

4. Enjoy.

[!NOTE]

Lua C modules get installed at /ucrt64/lib/lua/5.1 and .lua files at /ucrt64/share/lua/5.1 for the ucrt64 environment, in case you want to remove them.

Extra

If you guys want, I can contribute a Github workflow to test luasocket on MSYS2 tools.