Added downward compatibility for older APIs

The commit effa574 in 20.01.2017 added the bool textonly to the constructor of TessPDFRenderer. To maintain the compatibility to older APIs which are still using only two parameter, a default value for the textonly parameter is set.

Signed-off-by: Noah Metzger <noah.metzger@bib.uni-mannheim.de>

Author: noahmetzger

src/api/renderer.h

@@ -187,7 +187,7 @@ class TESS_API TessPDFRenderer : public TessResultRenderer {
  public:
   // datadir is the location of the TESSDATA. We need it because
   // we load a custom PDF font from this location.
-  TessPDFRenderer(const char* outputbase, const char* datadir, bool textonly);
+  TessPDFRenderer(const char* outputbase, const char* datadir, bool textonly = false);
 
  protected:
   virtual bool BeginDocumentHandler();