Tries to fix SDL and Qt builds, introduces Emscripten in Travis.

JGE/include/JSoundSystem.h

@@ -135,6 +135,8 @@ public:
 #elif (defined WIN32)
 	std::string filename;
 	void* mSample;
+#else
+	void* mSample;
 #endif
 };
 

JGE/src/Downloader.cpp

@@ -139,7 +139,7 @@ void DownloadRequest::fileDownloaded()
 
         // let's check some error
         if(mNetworkReply->error() != QNetworkReply::NoError) {
-            processError(mNetworkReply->error(), mNetworkReply->errorString().toStdString());
+            processError((int)mNetworkReply->error(), mNetworkReply->errorString().toStdString().c_str());
             break;
         }