Remove dependencies on obsolete __ARCH_WANT_SYSCALL_DEPRECATED system calls.

(aarch64 kernels don't have these system calls.)

Change-Id: I6f64075aa412f71520f2df71c3d69b647f91c1ca

libc/arch-x86_64/syscalls/__pselect6.S

@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <asm/unistd.h>
+#include <linux/err.h>
+#include <machine/asm.h>
+
+ENTRY(__pselect6)
+    movq    %rcx, %r10
+    movl    $__NR_pselect6, %eax
+    syscall
+    cmpq    $-MAX_ERRNO, %rax
+    jb      1f
+    negl    %eax
+    movl    %eax, %edi
+    call    __set_errno
+    orq     $-1, %rax
+1:
+    ret
+END(__pselect6)