gnu: QtWebKit: Fix building with glib 2.68.

* gnu/packages/patches/qtwebkit-fix-building-with-glib-2.68.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/qt.scm (qtwebkit)[source]: Use it.

Signed-off-by: Guillaume Le Vaillant <glv@posteo.net>

gnu/local.mk

@@ -1659,6 +1659,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/qtwebkit-pbutils-include.patch		\
   %D%/packages/patches/qtwebkit-fix-building-with-python-3.9.patch	\
   %D%/packages/patches/qtwebkit-fix-building-with-icu-68.patch	\
+  %D%/packages/patches/qtwebkit-fix-building-with-glib-2.68.patch	\
   %D%/packages/patches/randomjungle-disable-static-build.patch	\
   %D%/packages/patches/rapicorn-isnan.patch			\
   %D%/packages/patches/rapidjson-gcc-compat.patch		\

gnu/packages/patches/qtwebkit-fix-building-with-glib-2.68.patch

@@ -0,0 +1,21 @@
+Fix building with glib 2.68:
+
+https://github.com/qtwebkit/qtwebkit/issues/1057
+
+Patch copied from upstream pull request:
+
+https://github.com/qtwebkit/qtwebkit/pull/1058/commits/5b698ba3faffd4e198a45be9fe74f53307395e4b
+
+diff -aurN qtwebkit-5.212.0-alpha4/Source/WTF/wtf/glib/GRefPtr.h qtwebkit-5.212.0-alpha4-mod/Source/WTF/wtf/glib/GRefPtr.h
+--- qtwebkit-5.212.0-alpha4/Source/WTF/wtf/glib/GRefPtr.h	2020-03-04 18:16:37.000000000 +0100
++++ qtwebkit-5.212.0-alpha4-mod/Source/WTF/wtf/glib/GRefPtr.h	2021-04-05 06:58:44.763328636 +0200
+@@ -29,9 +29,6 @@
+ #include <wtf/RefPtr.h>
+ #include <algorithm>
+ 
+-extern "C" void g_object_unref(gpointer);
+-extern "C" gpointer g_object_ref_sink(gpointer);
+-
+ namespace WTF {
+ 
+ enum GRefPtrAdoptType { GRefPtrAdopt };

gnu/packages/qt.scm

@@ -2625,6 +2625,7 @@ different kinds of sliders, and much more.")
          (base32
           "1rm9sjkabxna67dl7myx9d9vpdyfxfdhrk9w7b94srkkjbd2d8cw"))
         (patches (search-patches "qtwebkit-pbutils-include.patch"
+                                 "qtwebkit-fix-building-with-glib-2.68.patch"
                                  "qtwebkit-fix-building-with-icu-68.patch"
                                  "qtwebkit-fix-building-with-python-3.9.patch"))))
     (build-system cmake-build-system)