fix hidden symbols

libc/sysdeps/linux/ia64/__longjmp.S

@@ -158,3 +158,5 @@ LEAF(__longjmp)
 	mov pr=r24,-1
 	ret
 END(__longjmp)
+
+libc_hidden_def(__longjmp)

libc/sysdeps/linux/ia64/fork.S

@@ -39,3 +39,4 @@ PSEUDO_END(__libc_fork)
 weak_alias (__libc_fork, __fork)
 libc_hidden_def (__fork)
 weak_alias (__libc_fork, fork)
+libc_hidden_weak (fork)