[LyX/master] Make doExport() helper private

[Georg Baum]

commit 4d3f9f3ede361952ea4b9f63ed11b8b90ddf89aa
Author: Georg Baum <b...@lyx.org>
Date:   Sun Nov 16 20:51:42 2014 +0100

    Make doExport() helper private
    
    One declaration of doExport() was not used, and the other one was only used 
by
    Buffer, so make it private since returning the exported file name is a bit
    strange if it can also appear as input argument.

diff --git a/src/Buffer.h b/src/Buffer.h
index ad6aeb8..97975f1 100644
--- a/src/Buffer.h
+++ b/src/Buffer.h
@@ -643,20 +643,17 @@ public:
        ///
        ExportStatus doExport(std::string const & target, bool put_in_tempdir) 
const;
        ///
-       ExportStatus doExport(std::string const & target, bool put_in_tempdir,
-               std::string & result_file) const;
-       ///
        ExportStatus preview(std::string const & format) const;
 
 private:
+       ///
+       ExportStatus doExport(std::string const & target, bool put_in_tempdir,
+               std::string & result_file) const;
        /// target is a format name optionally followed by a space
        /// and a destination file-name
        ExportStatus doExport(std::string const & target, bool put_in_tempdir,
                bool includeall, std::string & result_file) const;
        ///
-       ExportStatus doExport(std::string const & target, bool put_in_tempdir,
-               bool includeall) const;
-       ///
        ExportStatus preview(std::string const & format, bool includeall = 
false) const;
        ///
        void setMathFlavor(OutputParams & op) const;