Valgrind: Do not use native separators at all

Since valgrind only runs on POSIX systems, all the paths it produces are
normalized.

We have no mapping to local directory, so having a path like
\home\user\project\file.cpp is confusing.

Change-Id: Idff339729231ab662aa4fcb6bb732058c1a04f7c
Reviewed-by: hjk <hjk@theqtcompany.com>

src/plugins/valgrind/memcheckerrorview.cpp

@@ -109,7 +109,9 @@ static QString makeFrameName(const Frame &frame, const QString &relativeTo,
     if (frame.line() != -1)
         path += QLatin1Char(':') + QString::number(frame.line());
 
-    path = QDir::toNativeSeparators(path.toHtmlEscaped());
+    // Since valgrind only runs on POSIX systems, converting path separators
+    // will ruin the paths on Windows. Leave it untouched.
+    path = path.toHtmlEscaped();
 
     if (link && !f.isEmpty() && QFile::exists(fullPath)) {
         // make a hyperlink label