Clang: Set -fms-compatibility-version explicitly

Infer the version from the _MSC_FULL_VER macro, so it cannot get out of sync
with that.

Adapt the analyzer to do the same.

Based on

  commit daf08d8702
  Clang Static Analyzer: Workaround analyzing MSVC2015 projects with clang 3.8.0

Change-Id: I9d34abdbe2c83fe271eadd8d051caad43aca6772
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/cpptools/compileroptionsbuilder.h

@@ -51,6 +51,8 @@ public:
     virtual void addLanguageOption(ProjectFile::Kind fileKind);
     virtual void addOptionsForLanguage(bool checkForBorlandExtensions = true);
 
+    void addMsvcCompatibilityVersion();
+
 protected:
     virtual bool excludeDefineLine(const QByteArray &defineLine) const;
     virtual bool excludeHeaderPath(const QString &headerPath) const;