gnu: xpdf: Update to 3.04.

* gnu/packages/patches/xpdf-constchar.patch: Remove.
* gnu-system.am (dist_patch_DATA): Remove it.
* gnu/packages/pdf.scm (xpdf): Update to 3.04.  Remove patch.
  Add libpng as an input.

gnu-system.am

@@ -414,8 +414,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/vpnc-script.patch			\
   gnu/packages/patches/w3m-fix-compile.patch			\
   gnu/packages/patches/xf86-input-synaptics-glibc-2.20.patch	\
-  gnu/packages/patches/xmodmap-asprintf.patch			\
-  gnu/packages/patches/xpdf-constchar.patch
+  gnu/packages/patches/xmodmap-asprintf.patch
 
 bootstrapdir = $(guilemoduledir)/gnu/packages/bootstrap
 bootstrap_x86_64_linuxdir = $(bootstrapdir)/x86_64-linux

gnu/packages/patches/xpdf-constchar.patch

@@ -1,15 +0,0 @@
-This patch circumvents an error with 'const char *' to 'char *' conversion,
-see http://gnats.netbsd.org/45562 .
-
-diff -u a/xpdf/XPDFViewer.cc b/xpdf/XPDFViewer.cc
---- a/xpdf/XPDFViewer.cc        2011-08-15 23:08:53.000000000 +0200
-+++ b/xpdf/XPDFViewer.cc        2013-03-31 15:13:21.000000000 +0200
-@@ -1803,7 +1803,7 @@
-   menuPane = XmCreatePulldownMenu(toolBar, "zoomMenuPane", args, n);
-   for (i = 0; i < nZoomMenuItems; ++i) {
-     n = 0;
--    s = XmStringCreateLocalized(zoomMenuInfo[i].label);
-+    s = XmStringCreateLocalized((char *) zoomMenuInfo[i].label);
-     XtSetArg(args[n], XmNlabelString, s); ++n;
-     XtSetArg(args[n], XmNuserData, (XtPointer)i); ++n;
-     sprintf(buf, "zoom%d", i);

gnu/packages/pdf.scm

@@ -85,14 +85,13 @@
 (define-public xpdf
   (package
    (name "xpdf")
-   (version "3.03")
+   (version "3.04")
    (source (origin
             (method url-fetch)
             (uri (string-append "ftp://ftp.foolabs.com/pub/xpdf/xpdf-"
                                 version ".tar.gz"))
             (sha256 (base32
-                     "1jnfzdqc54wa73lw28kjv0m7120mksb0zkcn81jdlvijyvc67kq2"))
-            (patches (list (search-patch "xpdf-constchar.patch")))))
+                     "1rbp54mr3z2x3a3a1qmz8byzygzi223vckfam9ib5g1sfds0qf8i"))))
    (build-system gnu-build-system)
    (inputs `(("freetype" ,freetype)
              ("gs-fonts" ,gs-fonts)
@@ -103,6 +102,7 @@
              ("libxp" ,libxp)
              ("libxpm" ,libxpm)
              ("libxt" ,libxt)
+             ("libpng" ,libpng)
              ("zlib" ,zlib)))
    (arguments
     `(#:tests? #f ; there is no check target