Fix with poppler-26.06.0.

From https://gitlab.com/inkscape/inkscape/-/work_items/6210,
1.4.x-Poppler-26.06.0_rev0.patch

Index: src/extension/internal/pdfinput/pdf-utils.h
--- src/extension/internal/pdfinput/pdf-utils.h.orig
+++ src/extension/internal/pdfinput/pdf-utils.h
@@ -59,6 +59,9 @@ class ClipHistoryEntry (private)
 };
 
 Geom::Rect getRect(_POPPLER_CONST PDFRectangle *box);
+Geom::Rect getRect(_POPPLER_CONST PDFRectangle &box);
 Geom::PathVector getPathV(GfxPath *gPath);
+Geom::PathVector maybeIntersect(Geom::PathVector const &v1, Geom::PathVector const &v2,
+                                FillRule fill1 = FillRule::fill_nonZero, FillRule fill2 = FillRule::fill_nonZero);
 
 #endif /* PDF_UTILS_H */
