Fix mips build for nested signal handler

Bug: 17006816

(cherry picked from commit 5a18dde067daeb55f1368d5791c61e315bfa1d99)

Change-Id: Ia538e30012fed46cefba33092395c5361c571062
diff --git a/runtime/arch/mips/fault_handler_mips.cc b/runtime/arch/mips/fault_handler_mips.cc
index 0e76aab..aa6d68a 100644
--- a/runtime/arch/mips/fault_handler_mips.cc
+++ b/runtime/arch/mips/fault_handler_mips.cc
@@ -29,6 +29,9 @@
 
 namespace art {
 
+void FaultManager::HandleNestedSignal(int sig, siginfo_t* info, void* context) {
+}
+
 void FaultManager::GetMethodAndReturnPcAndSp(siginfo_t* siginfo, void* context,
                                              mirror::ArtMethod** out_method,
                                              uintptr_t* out_return_pc, uintptr_t* out_sp) {