Prepare for the next poppler update.

ok?

Ciao,
	Kili

Index: patches/patch-frmts_pdf_pdfobject_cpp
===================================================================
RCS file: patches/patch-frmts_pdf_pdfobject_cpp
diff -N patches/patch-frmts_pdf_pdfobject_cpp
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ patches/patch-frmts_pdf_pdfobject_cpp	6 Apr 2026 22:05:08 -0000
@@ -0,0 +1,18 @@
+Fix build with poppler-26.04.0.
+
+Index: frmts/pdf/pdfobject.cpp
+--- frmts/pdf/pdfobject.cpp.orig
++++ frmts/pdf/pdfobject.cpp
+@@ -1122,8 +1122,12 @@ const std::string &GDALPDFObjectPoppler::GetString()
+ {
+     if (GetType() == PDFObjectType_String)
+     {
++#if POPPLER_MAJOR_VERSION >= 26 && POPPLER_MINOR_VERSION >= 4
++        const std::string &osStdStr = m_poConst->getString();
++#else
+         const GooString *gooString = m_poConst->getString();
+         const std::string &osStdStr = gooString->toStr();
++#endif
+         const bool bLEUnicodeMarker =
+             osStdStr.size() >= 2 && static_cast<uint8_t>(osStdStr[0]) == 0xFE &&
+             static_cast<uint8_t>(osStdStr[1]) == 0xFF;