Win: Avoid long creator startup times with '\' in PATH

Task-number: QTCREATORBUG-6501
Change-Id: Idfe050486db2d486e895bf6670cad3084871c44a
Reviewed-by: Tobias Hunger <tobias.hunger@nokia.com>

src/libs/utils/environment.cpp

@@ -249,7 +249,10 @@ QString Environment::searchInPath(const QStringList &executables,
         if (exec.indexOf(slash) != -1)
             continue;
         foreach (const QString &p, path()) {
-            QString fp = p;
+            QString fp = QDir::fromNativeSeparators(p);
+            // Avoid turing / into // on windows which triggers windows to check
+            // for network drives!
+            if (!fp.endsWith(slash))
                 fp += slash;
             fp += exec;
             const QFileInfo fi(fp);