always include cstdint for kernels

src/pystencilssfg/ir/analysis.py

@@ -73,9 +73,11 @@ def collect_includes(file: SfgSourceFile) -> set[HeaderFile]:
             case SfgEntityDef(entity):
                 match entity:
                     case SfgKernelHandle(kernel, _):
-                        return set(
-                            HeaderFile.parse(h) for h in kernel.required_headers
-                        ) | visit_decl(entity)
+                        return (
+                            set(HeaderFile.parse(h) for h in kernel.required_headers)
+                            | {HeaderFile.parse("<cstdint>")}
+                            | visit_decl(entity)
+                        )
 
                     case SfgFunction(_, tree, _) | SfgMethod(_, tree, _):
                         return walk_syntax(tree) | visit_decl(entity)