* poppler/CairoOutputDev.cc:
	* poppler/CairoOutputDev.h:
	Fix the following fixme in CairoOutputDevice.

	// FIXME: This is quite right yet, we need to accumulate all
	// glyphs within one text object before we clip.  Right now this
	// just add this one string.

	The fix uses a strategy similar to the one the Splash backend.
	textClipPath is used to store the appended path from each call to
	endString(). The accumulated path is clipped in endTextObject.