Avoid logging functions from signal handler.

(cherry picked from commit 9007677fcbcd7cf01725e155920a8abfcb323c56)

Change-Id: Ic0163f43308c6a281ab3757d90933e5127843fed
diff --git a/libbacktrace/UnwindCurrent.h b/libbacktrace/UnwindCurrent.h
index acce110..41080c7 100644
--- a/libbacktrace/UnwindCurrent.h
+++ b/libbacktrace/UnwindCurrent.h
@@ -34,7 +34,7 @@
 
   virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset);
 
-  bool UnwindFromContext(size_t num_ignore_frames, bool resolve);
+  bool UnwindFromContext(size_t num_ignore_frames, bool within_handler);
 
   void ExtractContext(void* sigcontext);