Add sethostname(2).

Not very useful, but helps building stuff like toybox out of the box.

Change-Id: I110e39030452bd093a84278e019c5752d293718d
diff --git a/libc/arch-mips/syscalls/sethostname.S b/libc/arch-mips/syscalls/sethostname.S
new file mode 100644
index 0000000..2987b52
--- /dev/null
+++ b/libc/arch-mips/syscalls/sethostname.S
@@ -0,0 +1,19 @@
+/* Generated by gensyscalls.py. Do not edit. */
+
+#include <private/bionic_asm.h>
+
+ENTRY(sethostname)
+    .set noreorder
+    .cpload t9
+    li v0, __NR_sethostname
+    syscall
+    bnez a3, 1f
+    move a0, v0
+    j ra
+    nop
+1:
+    la t9,__set_errno_internal
+    j t9
+    nop
+    .set reorder
+END(sethostname)