These are the steps I have to do now: open the PDF from Evernote with Preview in Mac, rotate the pages, save the copy of the PDF on my desktop or elsewhere on my Mac, drag the new PDF into Evernote, delete the old PDF, and then delete the revised PDF from my Mac. You used to be able to rotate a PDF in Preview from Evernote and then the PDF would just save right back into Evernote without all the extra saving, dragging, and deleting. That just seems like a lot of steps, but if that's the only way do it, oh well...
I guess I need to submit a feature request for this to Evernote.