[patch] [pdftops] Add an option to disable splash

I have an application that parses the output of pdftops in order to locate text. I noticed that it didn't find anything in some files because they had transparencies and pdftops reverted to making the entire output an image generated by splash. The attached patches add a -nosplash option that avoids using splash, even though the output might not be correct. For this application, I will never view or print the ps, so I don't care if some images are messed up. poppler-0.89.0-nosplash.patch