GenericProject: remove trailing "/" from .includes paths

Paths in the .includes file are user edited and may contain trailing
slashes.
If these are not filtered out, the CppCompletionAssistProcessor
suggestions are missing the first character (e.g. rc/, not src/).

Change-Id: I19b4c811d504042d0a4eb4ee8961818b3e17051c
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/genericprojectmanager/genericproject.cpp

@@ -330,6 +330,8 @@ QStringList GenericProject::processEntries(const QStringList &paths,
 
         expandEnvironmentVariables(env, trimmedPath);
 
+        trimmedPath = Utils::FileName::fromUserInput(trimmedPath).toString();
+
         const QString absPath = QFileInfo(projectDir, trimmedPath).absoluteFilePath();
         absolutePaths.append(absPath);
         if (map)