remove unused header

yosupo06 · yosupo06 · commit 8e59e285f0a6 · 2023-03-19T23:46:23.000+09:00
diff --git a/atcoder/internal_bit.hpp b/atcoder/internal_bit.hpp
@@ -5,10 +5,6 @@
 #include <intrin.h>
 #endif
 
-#if __cplusplus >= 202002L
-#include <bit>
-#endif
-
 namespace atcoder {
 
 namespace internal {
