gnu: enblend-enfuse: Backport upstream fixes.

Backport changes for reproducible builds & missing include.

* gnu/packages/patches/enblend-enfuse-reproducible.patch: New file.
* gnu/local.mk: Register it.
* gnu/packages/photo.scm (enblend-enfuse)[source]: Use newly added patch. Add
snippet to fix missing header.
[arguments]<#:phases>: Remove 'add-missing-include.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

gnu/local.mk

@@ -1113,6 +1113,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/emacs-kv-fix-tests.patch	\
   %D%/packages/patches/emacs-pgtk-super-key-fix.patch	\
   %D%/packages/patches/emacs-xelb-ignore-length-element.patch	\
+  %D%/packages/patches/enblend-enfuse-reproducible.patch	\
   %D%/packages/patches/enjarify-setup-py.patch			\
   %D%/packages/patches/enlightenment-fix-setuid-path.patch	\
   %D%/packages/patches/erlang-man-path.patch			\

gnu/packages/patches/enblend-enfuse-reproducible.patch

@@ -0,0 +1,44 @@
+# HG changeset patch
+# User Bernhard M. Wiedemann <bwiedemann@suse.de>
+# Date 1502609999 -7200
+#      Sun Aug 13 09:39:59 2017 +0200
+# Node ID a98e00eed893f62dd8349fc2894abca3aff4b33a
+# Parent  41ce01b7d413b3654211da0147857e7d6a1495de
+Facilitate reproducible builds
+by allowing to externally hold constant the build date and time.
+See
+        https://reproducible-builds.org/specs/source-date-epoch/
+
+Backport asap.
+
+diff -r 41ce01b7d413 -r a98e00eed893 NEWS
+--- a/NEWS	Sun Aug 13 09:39:56 2017 +0200
++++ b/NEWS	Sun Aug 13 09:39:59 2017 +0200
+@@ -48,6 +48,12 @@
+           https://github.com/akrzemi1/Optional
+   where only "optional.hpp" is needed.
+ 
++- The environment variable SOURCE_DATE_EPOCH overrides the build
++  timestamp as recorded by the signatures.  See
++          https://reproducible-builds.org/specs/source-date-epoch/
++  for details.
++
++
+ 
+ * Version 4.2  "Compressor Road"
+ 
+diff -r 41ce01b7d413 -r a98e00eed893 src/DefaultSig.pm
+--- a/src/DefaultSig.pm	Sun Aug 13 09:39:56 2017 +0200
++++ b/src/DefaultSig.pm	Sun Aug 13 09:39:59 2017 +0200
+@@ -109,9 +109,10 @@
+ sub update_date_and_time {
+     my $self = shift;
+ 
++    my $now = $ENV{SOURCE_DATE_EPOCH} || time;
+     my ($second, $minute, $hour,
+         $day_of_month, $month, $year,
+-        $day_of_week) = $self->is_using_gmt() ? gmtime : localtime;
++        $day_of_week) = $self->is_using_gmt() ? gmtime($now) : localtime($now);
+ 
+     $self->{DATE} = $self->format_date($day_of_month, $month, $year + 1900, $day_of_week,
+                                        $self->weekdays->[$day_of_week],

gnu/packages/photo.scm

@@ -370,7 +370,18 @@ (define-public enblend-enfuse
                                   name "-" version ".tar.gz"))
               (sha256
                (base32
-                "0j5x011ilalb47ssah50ag0a4phgh1b0wdgxdbbp1gcyjcjf60w7"))))
+                "0j5x011ilalb47ssah50ag0a4phgh1b0wdgxdbbp1gcyjcjf60w7"))
+              (patches
+               ;; TODO: Remove when updating.
+               ;; Fixed upstream with a98e00eed893f62dd8349fc2894abca3aff4b33a.
+               (search-patches "enblend-enfuse-reproducible.patch"))
+              (modules '((guix build utils)))
+              (snippet
+               ;; TODO: Remove when updating.
+               ;; Fixed upstream with 81e25afe71146aaaf5058c604034f35d57e3be9d.
+               #~(substitute* "src/minimizer.cc"
+                   (("^#include <gsl/gsl_errno\\.h>" all)
+                    (string-append all "\n#include <limits>"))))))
     (build-system gnu-build-system)
     (native-inputs
      (list pkg-config
@@ -395,16 +406,8 @@ (define-public enblend-enfuse
            vigra
            zlib))
     (arguments
-     (list #:configure-flags
-           #~(list "--enable-openmp")
-           #:phases
-           #~(modify-phases %standard-phases
-               (add-after 'unpack 'add-missing-include
-                 (lambda _
-                   (substitute* "src/minimizer.h"
-                     ;; Fix error: ‘numeric_limits’ is not a member of ‘std’.
-                     (("#include <vector>" line)
-                      (string-append line "\n#include <limits>"))))))))
+     (list
+      #:configure-flags #~(list "--enable-openmp")))
     (home-page "https://enblend.sourceforge.net/")
     (synopsis "Tools for combining and blending images")
     (description