Workaround the zombie processes bug for pdftotext invocations

Index: Filters/FilterPdf.cs
===================================================================
RCS file: /cvs/gnome/beagle/Filters/FilterPdf.cs,v
retrieving revision 1.12
diff -u -B -p -r1.12 FilterPdf.cs
--- Filters/FilterPdf.cs	25 Jul 2005 14:56:46 -0000	1.12
+++ Filters/FilterPdf.cs	27 Jul 2005 14:27:06 -0000
@@ -87,6 +87,7 @@ namespace Beagle.Filters {
 				}
 			}
 			pout.Close ();
+			pc.WaitForExit ();
 			pc.Close ();
 		}
 		
@@ -123,6 +124,7 @@ namespace Beagle.Filters {
 				AppendStructuralBreak ();
 			}
 			pout.Close ();
+			pc.WaitForExit ();
 			pc.Close ();
 			Finished ();
 		}