IVcsControl: Add additionalToolsPath()

Add a method for a VCS to tell creator where it installed additional
tools that it came with. This is useful for e.g. git on windows
which ships with a nice bunch of unix tools.

Change-Id: Ibc5f2fb57307bfadad140bd57d83917e56d57153
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/coreplugin/iversioncontrol.h

@@ -198,6 +198,12 @@ public:
      */
     virtual QString vcsMakeWritableText() const;
 
+    /*!
+     * Return a list of paths where tools that came with the VCS may be installed.
+     * This is helpful on windows where e.g. git comes with a lot of nice unix tools.
+     */
+    virtual QStringList additionalToolsPath() const;
+
 signals:
     void repositoryChanged(const QString &repository);
     void filesChanged(const QStringList &files);