[poppler] pdftotext report error when it process pdf file generated from images?

[杨辉强]

Hi, all:
As is known to everyone, some pdf files are generated from images, i.e, 
the pdf file text can't be selected and copied, it just contains some 
images. When pdftotext process this type pdf file, it reports following 
errors:

Error: Missing language pack for 'Adobe-GB1' mapping
Error: Missing language pack for 'Adobe-GB1' mapping
Error: Unknown font tag 'F0'
Error (675): No font in show
Error (683): No font in show
Error (688): No font in show
Error (693): No font in show
Error (705): No font in show

   I wish you can give me some advices.

Thank you!
Best wishes!
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