[libc] use stddef instead of string header
diff --git a/libc/src/string/bzero.h b/libc/src/string/bzero.h
index a16e1d0..064800b 100644
--- a/libc/src/string/bzero.h
+++ b/libc/src/string/bzero.h
@@ -9,7 +9,7 @@
 #ifndef LLVM_LIBC_SRC_STRING_BZERO_H
 #define LLVM_LIBC_SRC_STRING_BZERO_H
 
-#include "include/string.h"
+#include <stddef.h> // size_t
 
 namespace __llvm_libc {