Windows build fails with Clang/MSVC due to missing #include <chrono> and const pointer type error

Environment

• OS: Windows 11
• Compiler: Clang 19 (via Visual Studio 2022 Build Tools + clang-cl)
• CMake: 3.x

Problem

Building on Windows with ClangCL fails with the following errors:

1. src/ggml-bitnet-mad.cpp line 811 — const pointer mismatch
   error: cannot initialize a variable of type 'int8_t *' with an rvalue of type 'const int8_t *'
   Fix: change int8_t * to const int8_t *

2. Missing #include in 3rdparty/llama.cpp submodule

The following files use std::chrono without explicitly including . On Linux/GCC it is pulled in implicitly,
but Clang on Windows is stricter:

• 3rdparty/llama.cpp/common/common.cpp
• 3rdparty/llama.cpp/common/log.cpp
• 3rdparty/llama.cpp/examples/imatrix/imatrix.cpp
• 3rdparty/llama.cpp/examples/perplexity/perplexity.cpp

Fix: add #include to each file.

Start with src/ggml-bitnet-mad.cpp around line 811 and the four listed files under 3rdparty/llama.cpp, checking their std::chrono usage and current includes. Verify the const pointer correction and explicit chrono includes by running the Windows 11 ClangCL CMake build; done means the reported compilation errors no longer occur.