build: Get rid of CLIENT_DATE

Putting the build date in the executable is a practice that has no place
in these days, now that deterministic building is increasingly common.

Continues #7732 which did this for the GUI.

src/init.cpp

@@ -757,7 +757,7 @@ void InitLogging()
     fLogIPs = GetBoolArg("-logips", DEFAULT_LOGIPS);
 
     LogPrintf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
-    LogPrintf("Bitcoin version %s (%s)\n", FormatFullVersion(), CLIENT_DATE);
+    LogPrintf("Bitcoin version %s\n", FormatFullVersion());
 }
 
 /** Initialize bitcoin.