fix build with poppler 0.64

GooString became const...

Change-Id: Icc95be2e8603a4e22c6a9ac2008986bacd0bfba5

sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.cxx

@@ -432,6 +432,9 @@ int PDFOutDev::parseFont( long long nNewId, GfxFont* gfxFont, GfxState* state )
     FontAttributes aNewFont;
     int nSize = 0;
 
+#if POPPLER_CHECK_VERSION(0, 64, 0)
+    const
+#endif
     GooString* pFamily = gfxFont->getName();
     if( pFamily )
     {
@@ -728,6 +731,9 @@ void PDFOutDev::updateFont(GfxState *state)
         FontAttributes aFont;
         int nEmbedSize=0;
 
+#if POPPLER_CHECK_VERSION(0, 64, 0)
+        const
+#endif
         Ref* pID = gfxFont->getID();
         // TODO(Q3): Portability problem
         long long fontID = static_cast<long long>(pID->gen) << 32 | static_cast<long long>(pID->num);
@@ -918,7 +924,11 @@ void PDFOutDev::drawChar(GfxState *state, double x, double y,
     printf( "\n" );
 }
 
+#if POPPLER_CHECK_VERSION(0, 64, 0)
+void PDFOutDev::drawString(GfxState*, const GooString* /*s*/)
+#else
 void PDFOutDev::drawString(GfxState*, GooString* /*s*/)
+#endif
 {
     // TODO(F3): NYI
 }

sdext/source/pdfimport/xpdfwrapper/pdfioutdev_gpl.hxx

@@ -224,7 +224,11 @@ namespace pdfi
                               double dx, double dy,
                               double originX, double originY,
                               CharCode code, int nBytes, Unicode *u, int uLen) override;
+#if POPPLER_CHECK_VERSION(0, 64, 0)
+        virtual void drawString(GfxState *state, const GooString *s) override;
+#else
         virtual void drawString(GfxState *state, GooString *s) override;
+#endif
         virtual void endTextObject(GfxState *state) override;
 
         //----- image drawing