Add syncfs(2).

GMM calls this system call directly at the moment. That's silly.

Bug: http://b/36405699
Test: ran tests
Change-Id: I1e14c0e5ce0bc2aa888d884845ac30dc20f13cd5
diff --git a/libc/arch-mips/syscalls/syncfs.S b/libc/arch-mips/syscalls/syncfs.S
new file mode 100644
index 0000000..cd87a61
--- /dev/null
+++ b/libc/arch-mips/syscalls/syncfs.S
@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(syncfs)
+    .set noreorder
+    .cpload t9
+    li v0, __NR_syncfs
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    la t9,__set_errno_internal
+    j t9
+    nop
+    .set reorder
+END(syncfs)