Switch sigpending over to rt_sigpending.

Change-Id: I7b28984796b5fb343cfbcc47e0afc3a84293d417
diff --git a/libc/arch-mips/syscalls/sigpending.S b/libc/arch-mips/syscalls/__rt_sigpending.S
similarity index 66%
rename from libc/arch-mips/syscalls/sigpending.S
rename to libc/arch-mips/syscalls/__rt_sigpending.S
index 45baa4f..bd4a96e 100644
--- a/libc/arch-mips/syscalls/sigpending.S
+++ b/libc/arch-mips/syscalls/__rt_sigpending.S
@@ -1,14 +1,14 @@
 /* autogenerated by gensyscalls.py */
 #include <asm/unistd.h>
     .text
-    .globl sigpending
+    .globl __rt_sigpending
     .align 4
-    .ent sigpending
+    .ent __rt_sigpending
 
-sigpending:
+__rt_sigpending:
     .set noreorder
     .cpload $t9
-    li $v0, __NR_sigpending
+    li $v0, __NR_rt_sigpending
     syscall
     bnez $a3, 1f
     move $a0, $v0
@@ -19,4 +19,4 @@
     j $t9
     nop
     .set reorder
-    .end sigpending
+    .end __rt_sigpending