Address compliance issues with coding guidelines.

src/util/debug.cpp

@@ -3,7 +3,7 @@
 #include <cstring>
 #include <iomanip>
 #include <iostream>
-#include <thread>
+#include <mutex>
 
 #include "util/debug.hpp"
 #include "util/ioutil.hpp"
@@ -28,7 +28,9 @@ bool failed_assertion(const char *assertion, const char *file,
     return false;
 }
 
-std::ostream& debug_emit_trace_leader(std::ostream &out, const char* file, int line, const char* varlist) {
+std::ostream& debug_emit_trace_leader(std::ostream& out, const char* file,
+                                      int line, const char* varlist)
+{
     iosfmt_guard _(out);
 
     const char* leaf = std::strrchr(file, '/');