flatpak: 1.2.4 -> 1.4.2

* Regenerated all patches for 1.4.2 and resolved
  any conflicts.

* fix-test-paths.patch doesn't copy the whole locale archive
  because we have C.UTF8 now.

* nixos/flatpak creates a Flatpak system helper user
  Change introduced in 1.3.2.

Changes:
See https://github.com/flatpak/flatpak/releases/tag/1.3.1 through
1.4.2.

pkgs/development/libraries/flatpak/respect-xml-catalog-files-var.patch

@@ -1,6 +1,8 @@
+diff --git a/acinclude.m4 b/acinclude.m4
+index 92ec3985..b3fccf1d 100644
 --- a/acinclude.m4
 +++ b/acinclude.m4
-@@ -40,8 +40,8 @@
+@@ -40,8 +40,8 @@ AC_DEFUN([JH_CHECK_XML_CATALOG],
  [
    AC_REQUIRE([JH_PATH_XML_CATALOG],[JH_PATH_XML_CATALOG(,[:])])dnl
    AC_MSG_CHECKING([for ifelse([$2],,[$1],[$2]) in XML catalog])