Remove unused guard

It is no longer used since switching to autotools build system.

src/qt/bitcoin.cpp

@@ -413,7 +413,6 @@ static void SetupUIArgs()
     gArgs.AddArg("-uiplatform", strprintf("Select platform to customize UI for (one of windows, macosx, other; default: %s)", BitcoinGUI::DEFAULT_UIPLATFORM), true, OptionsCategory::GUI);
 }
 
-#ifndef BITCOIN_QT_TEST
 int GuiMain(int argc, char* argv[])
 {
 #ifdef WIN32
@@ -593,4 +592,3 @@ int GuiMain(int argc, char* argv[])
     }
     return rv;
 }
-#endif // BITCOIN_QT_TEST