Ignore some warnings

.clang-tidy

@@ -1,6 +1,7 @@
 Checks: '*,
   -altera-unroll-loops,
   -llvmlibc-callee-namespace,
+  -llvmlibc-restrict-system-libc-headers,
   -llvm-header-guard,
   -llvm-namespace-comment,
   -google-build-using-namespace,
@@ -9,6 +10,7 @@ Checks: '*,
   -fuchsia-statically-constructed-objects,
   -cppcoreguidelines-pro-bounds-array-to-pointer-decay,
   -cppcoreguidelines-pro-bounds-constant-array-index,
+  -cppcoreguidelines-pro-type-static-cast-downcast,
   -cppcoreguidelines-pro-type-union-access,
   -cppcoreguidelines-pro-type-cstyle-cast,
   -cppcoreguidelines-pro-type-vararg,