Hide rt_sigqueueinfo.

Bug: 19358804
Change-Id: I38a53ad64c81d0eefdd1d24599e769fd8a477a56
diff --git a/libc/arch-arm64/syscalls/__rt_sigqueueinfo.S b/libc/arch-arm64/syscalls/___rt_sigqueueinfo.S
similarity index 75%
rename from libc/arch-arm64/syscalls/__rt_sigqueueinfo.S
rename to libc/arch-arm64/syscalls/___rt_sigqueueinfo.S
index 2b23e18..85ea132 100644
--- a/libc/arch-arm64/syscalls/__rt_sigqueueinfo.S
+++ b/libc/arch-arm64/syscalls/___rt_sigqueueinfo.S
@@ -2,7 +2,7 @@
 
 #include <private/bionic_asm.h>
 
-ENTRY(__rt_sigqueueinfo)
+ENTRY(___rt_sigqueueinfo)
     mov     x8, __NR_rt_sigqueueinfo
     svc     #0
 
@@ -11,5 +11,5 @@
     b.hi    __set_errno_internal
 
     ret
-END(__rt_sigqueueinfo)
-.hidden __rt_sigqueueinfo
+END(___rt_sigqueueinfo)
+.hidden ___rt_sigqueueinfo