This patch removes includes of two files that we do not have.
Package builds and works fine without them.

diff -burN php-pecl-pdflib-1.0.orig/pdflib-1.0/pdf.c php-pecl-pdflib-1.0/pdflib-1.0/pdf.c
--- php-pecl-pdflib-1.0.orig/pdflib-1.0/pdf.c	2004-11-11 13:32:26.000000000 +0100
+++ php-pecl-pdflib-1.0/pdflib-1.0/pdf.c	2004-11-11 15:12:54.874016688 +0100
@@ -39,9 +39,9 @@
 #include "php_streams.h"
 
 #if HAVE_LIBGD13
-#include "ext/gd/php_gd.h"
+//#include "ext/gd/php_gd.h"
 #if HAVE_GD_BUNDLED
-#include "ext/gd/libgd/gd.h"
+//#include "ext/gd/libgd/gd.h"
 #else
 #include "gd.h"
 #endif