Fix/suppress bionic google-explicit-constructor warnings

* Add explicit to conversion constructors/operators

Bug: 28341362
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,google-explicit-constructor
Change-Id: Id1ad0327c1b8c6f094bcbb3ae599bc1f716b3f2f
diff --git a/libc/private/ScopedSignalHandler.h b/libc/private/ScopedSignalHandler.h
index dd5823f..7031752 100644
--- a/libc/private/ScopedSignalHandler.h
+++ b/libc/private/ScopedSignalHandler.h
@@ -33,7 +33,7 @@
     sigaction64(signal_number_, &action_, &old_action_);
   }
 
-  ScopedSignalHandler(int signal_number) : signal_number_(signal_number) {
+  explicit ScopedSignalHandler(int signal_number) : signal_number_(signal_number) {
     sigaction64(signal_number, nullptr, &old_action_);
   }