libc: Add missing waitid() implementation.

Change-Id: I312ee608dbf9249e4886a10d45d13e3cda8a9042
diff --git a/libc/arch-sh/syscalls.mk b/libc/arch-sh/syscalls.mk
index 3e2274f..47b5a1e 100644
--- a/libc/arch-sh/syscalls.mk
+++ b/libc/arch-sh/syscalls.mk
@@ -4,7 +4,7 @@
 syscall_src += arch-sh/syscalls/_exit_thread.S
 syscall_src += arch-sh/syscalls/__fork.S
 syscall_src += arch-sh/syscalls/_waitpid.S
-syscall_src += arch-sh/syscalls/waitid.S
+syscall_src += arch-sh/syscalls/__waitid.S
 syscall_src += arch-sh/syscalls/__sys_clone.S
 syscall_src += arch-sh/syscalls/execve.S
 syscall_src += arch-sh/syscalls/__setuid.S
diff --git a/libc/arch-sh/syscalls/waitid.S b/libc/arch-sh/syscalls/__waitid.S
similarity index 90%
rename from libc/arch-sh/syscalls/waitid.S
rename to libc/arch-sh/syscalls/__waitid.S
index 1f0432d..1f58de0 100644
--- a/libc/arch-sh/syscalls/waitid.S
+++ b/libc/arch-sh/syscalls/__waitid.S
@@ -2,11 +2,11 @@
 #include <sys/linux-syscalls.h>
 
     .text
-    .type waitid, @function
-    .globl waitid
+    .type __waitid, @function
+    .globl __waitid
     .align 4
 
-waitid:
+__waitid:
 
     /* get ready for additonal arg */
     mov.l   @r15, r0