make arch __clone backends hidden

these are not a public interface and are not intended to be callable
from anywhere but the public clone function or other places in libc.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index 3479bcf6..3c85544c 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -141,7 +141,7 @@ int __init_tp(void *);
 void *__copy_tls(unsigned char *);
 void __reset_tls();
 
-int __clone(int (*)(void *), void *, int, void *, ...);
+hidden int __clone(int (*)(void *), void *, int, void *, ...);
 int __set_thread_area(void *);
 int __libc_sigaction(int, const struct sigaction *, struct sigaction *);
 void __unmapself(void *, size_t);