fix DISABLE_GRAPHICS build (google code issue 1490)
fix DISABLE_GRAPHICS build (google code issue 1490)

jbarlow83/tesseract,amitdo/tesseract,jbarlow83/tesseract,amitdo/tesseract,stweil/tesseract,stweil/tesseract,tesseract-ocr/tesseract,tesseract-ocr/tesseract,UB-Mannheim/tesseract,jbarlow83/tesseract,UB-Mannheim/tesseract,tesseract-ocr/tesseract,UB-Mannheim/tesseract,UB-Mannheim/tesseract,stweil/tesseract,stweil/tesseract,UB-Mannheim/tesseract,amitdo/tesseract,jbarlow83/tesseract,amitdo/tesseract,tesseract-ocr/tesseract,amitdo/tesseract,stweil/tesseract,jbarlow83/tesseract,tesseract-ocr/tesseract