Prevent Luatex from writing filesystem location of included PDFs to the document.

luatex-0.78.3_prevent-PTEX.FileName.patch

Index: source/texk/web2c/luatexdir/image/writeimg.w
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diff --git a/trunk/source/texk/web2c/luatexdir/image/writeimg.w b/trunk/source/texk/web2c/luatexdir/image/writeimg.w
--- a/trunk/source/texk/web2c/luatexdir/image/writeimg.w	(revision 4837)
+++ b/trunk/source/texk/web2c/luatexdir/image/writeimg.w	(working copy)
@@ -693,7 +693,7 @@
     // write additional information
     snprintf(s, 20, "%s.FileName", pdfkeyprefix);
     pdf_add_name(pdf, s);
-    pdf_printf(pdf, " (%s)", convertStringToPDFString(p, strlen(p)));
+    pdf_printf(pdf, " (censored)");
 }
 
 @ To allow the use of \.{\\pdfrefximage} inside saved boxes in -ini mode,