MIPS hasn't supported SA_RESTORER since 2.5 kernels.

Change-Id: Ia3500168ab5ba5ba381d0195e9ecc26a618bf505
diff --git a/ndk/sources/android/libportable/arch-mips/signal.c b/ndk/sources/android/libportable/arch-mips/signal.c
index a06eff7..0c38d14 100644
--- a/ndk/sources/android/libportable/arch-mips/signal.c
+++ b/ndk/sources/android/libportable/arch-mips/signal.c
@@ -1027,7 +1027,7 @@
         ALOGV("%s: SA_THIRTYTWO_PORTABLE isn't SUPPORTED.", __func__);
     }
     if (portable_flags & SA_RESTORER_PORTABLE) {
-        mips_flags |= SA_RESTORER;
+        ALOGV("%s: SA_RESTORER isn't SUPPORTED.", __func__);
     }
     if (portable_flags & SA_ONSTACK_PORTABLE) {
         mips_flags |= SA_ONSTACK;
@@ -1059,7 +1059,6 @@
 #ifdef SA_THIRTYTWO
     if (mips_flags & SA_THIRTYTWO)      portable_flags |= SA_THIRTYTWO_PORTABLE;
 #endif
-    if (mips_flags & SA_RESTORER)       portable_flags |= SA_RESTORER_PORTABLE;
     if (mips_flags & SA_ONSTACK)        portable_flags |= SA_ONSTACK_PORTABLE;
     if (mips_flags & SA_RESTART)        portable_flags |= SA_RESTART_PORTABLE;
     if (mips_flags & SA_NODEFER)        portable_flags |= SA_NODEFER_PORTABLE;