21.1.1

• Updated Mesa3D to 21.1.1.

Build script

• Fix lavapipe build with MinGW static CRT without using out of tree patch;
• MSYS2: Use Meson find_library to switch zlib and ZSTD dependencies to static linking;
• LLVM: Add SPIRV LLVM Translator build required by Microsoft OpenCL compiler;
• LLVM: Add AMDGPU target required by RADV;
• LLVM: Refactor build configuration command to match Mesa3D CI as much as possible;
• Mesa3D source fetch: Adjust default branch to main.

Out of tree patches

• Limit lavapipe patches to 21.1 before 21.1.1 stable as both got backported.

Build environment info dumper

• Always use x64 config tool to find LLVM, fixes e258764;
• Add manually updated Vulkan SDK version.

Build environment updates

• MSYS2 MinGW-w64 GCC
• MSVC