Remove mips test workarounds.

The mips/mips64 targets were never able to pass these tests, and the
supported architectures don't need any of these workarounds.

Test: treehugger
Change-Id: I640a8b7a98ae13d9d9cdb09b0fbef61d31d4c79a
diff --git a/tests/signal_test.cpp b/tests/signal_test.cpp
index eec56dc..3c66034 100644
--- a/tests/signal_test.cpp
+++ b/tests/signal_test.cpp
@@ -282,8 +282,7 @@
                           int sig) {
   // Both bionic and glibc set SA_RESTORER when talking to the kernel on arm,
   // arm64, x86, and x86-64. The version of glibc we're using also doesn't
-  // define SA_RESTORER, but luckily it's the same value everywhere, and mips
-  // doesn't use the bit for anything.
+  // define SA_RESTORER, but luckily it's the same value everywhere.
   static const unsigned sa_restorer = 0x4000000;
 
   // See what's currently set for this signal.
@@ -598,19 +597,13 @@
 }
 
 TEST(signal, limits) {
-  // This comes from the kernel.
+  // These come from the kernel.
   ASSERT_EQ(32, __SIGRTMIN);
+  ASSERT_EQ(64, __SIGRTMAX);
 
   // We reserve a non-zero number at the bottom for ourselves.
   ASSERT_GT(SIGRTMIN, __SIGRTMIN);
 
-  // MIPS has more signals than everyone else.
-#if defined(__mips__)
-  ASSERT_EQ(128, __SIGRTMAX);
-#else
-  ASSERT_EQ(64, __SIGRTMAX);
-#endif
-
   // We don't currently reserve any at the top.
   ASSERT_EQ(SIGRTMAX, __SIGRTMAX);
 }