Move away from the __ARCH_WANT_SYSCALL_NO_AT system calls.

Modern architectures only get the *at(2) system calls. For example,
aarch64 doesn't have open(2), and expects userspace to use openat(2)
instead.

Change-Id: I87b4ed79790cb8a80844f5544ac1a13fda26c7b5
diff --git a/libc/arch-mips/syscalls.mk b/libc/arch-mips/syscalls.mk
index fc96222..621dbac 100644
--- a/libc/arch-mips/syscalls.mk
+++ b/libc/arch-mips/syscalls.mk
@@ -37,14 +37,11 @@
 syscall_src += arch-mips/syscalls/_flush_cache.S
 syscall_src += arch-mips/syscalls/_waitpid.S
 syscall_src += arch-mips/syscalls/accept.S
-syscall_src += arch-mips/syscalls/access.S
 syscall_src += arch-mips/syscalls/acct.S
 syscall_src += arch-mips/syscalls/bind.S
 syscall_src += arch-mips/syscalls/capget.S
 syscall_src += arch-mips/syscalls/capset.S
 syscall_src += arch-mips/syscalls/chdir.S
-syscall_src += arch-mips/syscalls/chmod.S
-syscall_src += arch-mips/syscalls/chown.S
 syscall_src += arch-mips/syscalls/chroot.S
 syscall_src += arch-mips/syscalls/clock_getres.S
 syscall_src += arch-mips/syscalls/clock_gettime.S
@@ -107,21 +104,18 @@
 syscall_src += arch-mips/syscalls/ioprio_set.S
 syscall_src += arch-mips/syscalls/kill.S
 syscall_src += arch-mips/syscalls/klogctl.S
-syscall_src += arch-mips/syscalls/lchown.S
 syscall_src += arch-mips/syscalls/lgetxattr.S
-syscall_src += arch-mips/syscalls/link.S
+syscall_src += arch-mips/syscalls/linkat.S
 syscall_src += arch-mips/syscalls/listen.S
 syscall_src += arch-mips/syscalls/listxattr.S
 syscall_src += arch-mips/syscalls/llistxattr.S
 syscall_src += arch-mips/syscalls/lremovexattr.S
 syscall_src += arch-mips/syscalls/lseek.S
 syscall_src += arch-mips/syscalls/lsetxattr.S
-syscall_src += arch-mips/syscalls/lstat.S
 syscall_src += arch-mips/syscalls/madvise.S
 syscall_src += arch-mips/syscalls/mincore.S
-syscall_src += arch-mips/syscalls/mkdir.S
 syscall_src += arch-mips/syscalls/mkdirat.S
-syscall_src += arch-mips/syscalls/mknod.S
+syscall_src += arch-mips/syscalls/mknodat.S
 syscall_src += arch-mips/syscalls/mlock.S
 syscall_src += arch-mips/syscalls/mlockall.S
 syscall_src += arch-mips/syscalls/mount.S
@@ -142,14 +136,12 @@
 syscall_src += arch-mips/syscalls/pwrite64.S
 syscall_src += arch-mips/syscalls/read.S
 syscall_src += arch-mips/syscalls/readahead.S
-syscall_src += arch-mips/syscalls/readlink.S
+syscall_src += arch-mips/syscalls/readlinkat.S
 syscall_src += arch-mips/syscalls/readv.S
 syscall_src += arch-mips/syscalls/recvfrom.S
 syscall_src += arch-mips/syscalls/recvmsg.S
 syscall_src += arch-mips/syscalls/removexattr.S
-syscall_src += arch-mips/syscalls/rename.S
 syscall_src += arch-mips/syscalls/renameat.S
-syscall_src += arch-mips/syscalls/rmdir.S
 syscall_src += arch-mips/syscalls/sched_get_priority_max.S
 syscall_src += arch-mips/syscalls/sched_get_priority_min.S
 syscall_src += arch-mips/syscalls/sched_getparam.S
@@ -184,10 +176,9 @@
 syscall_src += arch-mips/syscalls/signalfd4.S
 syscall_src += arch-mips/syscalls/socket.S
 syscall_src += arch-mips/syscalls/socketpair.S
-syscall_src += arch-mips/syscalls/stat.S
 syscall_src += arch-mips/syscalls/swapoff.S
 syscall_src += arch-mips/syscalls/swapon.S
-syscall_src += arch-mips/syscalls/symlink.S
+syscall_src += arch-mips/syscalls/symlinkat.S
 syscall_src += arch-mips/syscalls/sync.S
 syscall_src += arch-mips/syscalls/syscall.S
 syscall_src += arch-mips/syscalls/sysinfo.S
@@ -202,11 +193,9 @@
 syscall_src += arch-mips/syscalls/umask.S
 syscall_src += arch-mips/syscalls/umount2.S
 syscall_src += arch-mips/syscalls/uname.S
-syscall_src += arch-mips/syscalls/unlink.S
 syscall_src += arch-mips/syscalls/unlinkat.S
 syscall_src += arch-mips/syscalls/unshare.S
 syscall_src += arch-mips/syscalls/utimensat.S
-syscall_src += arch-mips/syscalls/utimes.S
 syscall_src += arch-mips/syscalls/wait4.S
 syscall_src += arch-mips/syscalls/write.S
 syscall_src += arch-mips/syscalls/writev.S