Use ENTRY_PRIVATE in __bionic_clone assembler.

Bug: N/A
Test: bionic tests
Change-Id: Ic651d628be009487a36d0b2e5bcf900b981b1ef9
diff --git a/libc/arch-x86_64/bionic/__bionic_clone.S b/libc/arch-x86_64/bionic/__bionic_clone.S
index 0c73e5f..a4245b8 100644
--- a/libc/arch-x86_64/bionic/__bionic_clone.S
+++ b/libc/arch-x86_64/bionic/__bionic_clone.S
@@ -29,7 +29,7 @@
 #include <private/bionic_asm.h>
 
 // pid_t __bionic_clone(int flags, void* child_stack, pid_t* parent_tid, void* tls, pid_t* child_tid, int (*fn)(void*), void* arg);
-ENTRY(__bionic_clone)
+ENTRY_PRIVATE(__bionic_clone)
         # Copy 'fn' and 'arg' onto the child stack.
         movq    %r9, -16(%rsi)  # fn
         movq    8(%rsp), %rax   # Read 'arg'.
@@ -74,4 +74,3 @@
         # We're the parent; nothing to do.
         ret
 END(__bionic_clone)
-.hidden __bionic_clone