package-lists/guix-manifest: Include requirements for Next.

.package-lists/guix-manifest.scm

@@ -137,6 +137,7 @@
     "git:credential-netrc"
     "git:send-email"
     "git:subtree"
+    "glib-networking"
     "glib:doc"
     "glibc-utf8-locales"
     "gnu-standards"
@@ -144,6 +145,7 @@
     "go-ipfs"
     "graphviz"
     "grep"
+    "gsettings-desktop-schemas"
     "gst-libav"
     "gst-plugins-bad"
     "gst-plugins-base"
@@ -257,6 +259,7 @@
     "upx"
     "v4l-utils"
     "valgrind"
+    "webkitgtk"
     "webkitgtk:doc"
     "wget"
     "wine"