Fix QtWebEngineProcess name on Windows

QtWebEngineProcess has an exe extension that need to be added
to processPath.

Change-Id: I2ab1691f7af35c76bf693046396b5464e0f2dde2
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>

src/core/web_engine_library_info.cpp

@@ -99,8 +99,13 @@ QString location(QLibraryInfo::LibraryLocation path)
 QString subProcessPath()
 {
     static bool initialized = false;
+#if defined(OS_WIN)
+    static QString processPath (location(QLibraryInfo::LibraryExecutablesPath)
+                                % QDir::separator() % QStringLiteral(QTWEBENGINEPROCESS_NAME) % QStringLiteral(".exe"));
+#else
     static QString processPath (location(QLibraryInfo::LibraryExecutablesPath)
                                 % QDir::separator() % QStringLiteral(QTWEBENGINEPROCESS_NAME));
+#endif
     if (!initialized) {
         // Allow overriding at runtime for the time being.
         const QByteArray fromEnv = qgetenv("QTWEBENGINEPROCESS_PATH");