fix: remove build date and time from main.cpp

This is the first step to having reproducible builds. It
should allow to make an identical build in the same environment
and increase privacy when sharing logs, because the build time
was not in UTC.

src/main.cpp

@@ -185,8 +185,7 @@ int main(int argc, char* argv[])
 
     // Process arguments
     QCommandLineParser parser;
-    parser.setApplicationDescription("qTox, version: " + QString(GIT_VERSION) + "\nBuilt: "
-                                     + __TIME__ + " " + __DATE__);
+    parser.setApplicationDescription("qTox, version: " + QString(GIT_VERSION));
     parser.addHelpOption();
     parser.addVersionOption();
     parser.addPositionalArgument("uri", QObject::tr("Tox URI to parse"));
@@ -253,7 +252,6 @@ int main(int argc, char* argv[])
     QCoreApplication::addLibraryPath(QCoreApplication::applicationDirPath());
     a->addLibraryPath("platforms");
 
-    qDebug() << "built on: " << __TIME__ << __DATE__ << "(" << TIMESTAMP << ")";
     qDebug() << "commit: " << GIT_VERSION;