Add project files (part 1/2)

Co-Authored-By: Claude Sonnet 5 <[email protected]>

cmake/imports/kernel32.def

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+LIBRARY kernel32.dll
+EXPORTS
+CloseHandle
+CreateDirectoryW
+CreateFileW
+CreateThread
+DeleteFileW
+DisableThreadLibraryCalls
+FindClose
+FindFirstFileW
+FindNextFileW
+FreeLibraryAndExitThread
+GetCurrentProcessId
+GetFileSize
+GetLastError
+GetModuleHandleA
+GetProcAddress
+GetStdHandle
+GetSystemTimeAsFileTime
+GetTempPathW
+LoadLibraryA
+OutputDebugStringA
+QueryPerformanceCounter
+QueryPerformanceFrequency
+MultiByteToWideChar
+ReadFile
+Sleep
+WideCharToMultiByte
+WriteFile

cmake/imports/shell32.def

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+LIBRARY shell32.dll
+EXPORTS
+ShellExecuteW

cmake/imports/ucrtbase.def

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+LIBRARY ucrtbase.dll
+EXPORTS
+__stdio_common_vsprintf
+__stdio_common_vsscanf
+__stdio_common_vswprintf
+_hypotf
+_register_onexit_function
+_time64
+_wgetenv
+abort
+acos
+acosf
+atan2
+atan2f
+bsearch
+calloc
+ceilf
+cos
+cosf
+expf
+fclose
+feof
+floor
+floorf
+fmod
+fmodf
+fopen
+fopen_s
+fread
+free
+fseek
+ftell
+hypot
+ldexp
+localeconv
+logf
+malloc
+memcpy
+memmove
+memset
+pow
+powf
+qsort
+realloc
+roundf
+sin
+sinf
+sqrt
+sqrtf
+strcmp
+strlen
+strncmp
+strncpy
+strtod
+strtol
+tanf
+tolower
+truncf
+wcslen
+wcsncpy_s

cmake/imports/user32.def

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+LIBRARY user32.dll
+EXPORTS
+GetForegroundWindow
+GetWindowThreadProcessId
+IsWindowUnicode

cmake/toolchain-windows-clang-cl.cmake

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+# Cross-compile the Windows DLL from Linux / macOS with clang-cl + lld-link.
+# No Windows SDK is needed: the code declares the few Win32 / UCRT functions it uses itself and links against
+# import libraries that CMakeLists.txt generates from cmake/imports/*.def (llvm-dlltool).
+#
+#   cmake -S . -B build/cmake -DCMAKE_TOOLCHAIN_FILE=cmake/toolchain-windows-clang-cl.cmake
+#   cmake --build build/cmake            ->  build/cmake/slinky.dll
+set(CMAKE_SYSTEM_NAME Windows)
+set(CMAKE_SYSTEM_PROCESSOR AMD64)
+set(CMAKE_C_COMPILER clang-cl)
+set(CMAKE_CXX_COMPILER clang-cl)
+set(CMAKE_C_COMPILER_TARGET x86_64-pc-windows-msvc)
+set(CMAKE_CXX_COMPILER_TARGET x86_64-pc-windows-msvc)
+set(CMAKE_LINKER lld-link)
+set(CMAKE_AR llvm-lib)
+set(CMAKE_RC_COMPILER llvm-rc)
+# the compiler check must not need the SDK's libraries
+set(CMAKE_TRY_COMPILE_TARGET_TYPE STATIC_LIBRARY)
+# the flags the engine code was verified with are set explicitly in CMakeLists.txt: drop CMake's MSVC defaults
+# (/EHsc, /GR, /MD, /O2 /Ob2 /DNDEBUG ...)
+set(CMAKE_C_FLAGS_INIT "")
+set(CMAKE_CXX_FLAGS_INIT "")
+set(CMAKE_C_FLAGS_RELEASE_INIT "")
+set(CMAKE_CXX_FLAGS_RELEASE_INIT "")
+set(CMAKE_MSVC_RUNTIME_LIBRARY "")
+set(CMAKE_C_STANDARD_LIBRARIES "" CACHE STRING "" FORCE)
+set(CMAKE_CXX_STANDARD_LIBRARIES "" CACHE STRING "" FORCE)