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.cpp

@@ -33,6 +33,7 @@
 #include <utils/qtcassert.h>
 
 #include <QFileInfo>
+#include <QStringList>
 
 /*!
     \class Core::IVersionControl::TopicCache
@@ -76,6 +77,11 @@ QString IVersionControl::vcsMakeWritableText() const
     return QString();
 }
 
+QStringList IVersionControl::additionalToolsPath() const
+{
+    return QStringList();
+}
+
 QString IVersionControl::vcsTopic(const QString &topLevel)
 {
     return m_topicCache ? m_topicCache->topic(topLevel) : QString();