Fix MSVC compiler errors

CMakeLists.txt

@@ -73,6 +73,17 @@ else()
   FetchContent_Declare(antlr4 ${_antlr_fetch_args})
   FetchContent_MakeAvailable(antlr4)
 
+  # The runtime forgets some standard #includes (<chrono> for one), which newer
+  # standard libraries, notably Visual C++'s, no longer paper over. Supply them.
+  if(TARGET antlr4_static)
+    set(_compat "${CMAKE_CURRENT_SOURCE_DIR}/cmake/antlr_runtime_compat.h")
+    if(MSVC)
+      target_compile_options(antlr4_static PRIVATE "/FI${_compat}")
+    else()
+      target_compile_options(antlr4_static PRIVATE -include "${_compat}")
+    endif()
+  endif()
+
   set(ANTLRLAB_RUNTIME_LIBS antlr4_static)
   set(ANTLRLAB_RUNTIME_INCLUDES "${antlr4_SOURCE_DIR}/runtime/Cpp/runtime/src")
   set(ANTLRLAB_RUNTIME_DEFS ANTLR4CPP_STATIC)