Allow for sig chain to be disabled.

Tools like dex2oat or patchoat don't need the sig chain or the fault
manager. This also enables building a statically link version of
dex2oat.

Change-Id: I9897728cac48acade854bb027bfde860628ebf84
diff --git a/cmdline/cmdline.h b/cmdline/cmdline.h
index 2967e27..2e9f208 100644
--- a/cmdline/cmdline.h
+++ b/cmdline/cmdline.h
@@ -104,7 +104,9 @@
   options.push_back(
       std::make_pair("imageinstructionset",
                      reinterpret_cast<const void*>(GetInstructionSetString(instruction_set))));
-
+  // None of the command line tools need sig chain. If this changes we'll need
+  // to upgrade this option to a proper parameter.
+  options.push_back(std::make_pair("-Xno-sig-chain", nullptr));
   if (!Runtime::Create(options, false)) {
     fprintf(stderr, "Failed to create runtime\n");
     return nullptr;