fReopenDebugLog and fRequestShutdown should be type sig_atomic_t

This allows access as an atomic variable in the presence
of async interrupts.

See issue #7433 for more details
fixes: #7433

src/util.cpp

@@ -107,9 +107,10 @@ bool fPrintToDebugLog = true;
 bool fDaemon = false;
 bool fServer = false;
 string strMiscWarning;
-bool fLogTimestamps = false;
-bool fLogIPs = false;
-volatile bool fReopenDebugLog = false;
+bool fLogTimestamps = DEFAULT_LOGTIMESTAMPS;
+bool fLogTimeMicros = DEFAULT_LOGTIMEMICROS;
+bool fLogIPs = DEFAULT_LOGIPS;
+volatile sig_atomic_t fReopenDebugLog = false;
 CTranslationInterface translationInterface;
 
 /** Init OpenSSL library multithreading support */