alpha/__syscall_rt_sigaction.S: make the function hidden on non-NPTL

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

libc/sysdeps/linux/alpha/__syscall_rt_sigaction.S

@@ -31,6 +31,9 @@
 	.text
 
 .globl __syscall_rt_sigaction
+#ifndef __UCLIBC_HAS_THREADS_NATIVE__
+.hidden __syscall_rt_sigaction
+#endif
 .align 4
 .ent __syscall_rt_sigaction, 0
 __syscall_rt_sigaction: