Implement <sys/fsuid.h>.

Change-Id: I1e5e50444a1b5a430ba5b5d9b8b1d91219af5e92
diff --git a/libc/arch-x86/syscalls/setfsuid.S b/libc/arch-x86/syscalls/setfsuid.S
new file mode 100644
index 0000000..5856a16
--- /dev/null
+++ b/libc/arch-x86/syscalls/setfsuid.S
@@ -0,0 +1,21 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(setfsuid)
+    pushl   %ebx
+    .cfi_def_cfa_offset 8
+    .cfi_rel_offset ebx, 0
+    mov     8(%esp), %ebx
+    movl    $__NR_setfsuid, %eax
+    int     $0x80
+    cmpl    $-MAX_ERRNO, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+1:
+    popl    %ebx
+    ret
+END(setfsuid)