Split flatpak-spawn into a separate sub-package

The org.freedesktop.Flatpak user D-Bus service isn't just used by
flatpak(1) or applications running as Flatpaks. It's also used by
toolbox(1) for similar reasons:
 * To keep various configuration files inside the container
   synchronized with the host
 * To let the container request certain commands to be run on the host

Unfortunately, the utilities other than flatpak-spawn (ie., xdg-email
and xdg-email) that are meant to replace their counterparts in the
xdg-utils package don't work inside Toolbox containers [1]. Moreover,
there are RPM packages out there (eg., google-chrome) that "Require"
xdg-utils. This causes conflicts if flatpak-xdg-utils is installed.

Since Toolbox only needs flatpak-spawn to be present inside a
container, there's no need to pull in the other utilities in the first
place. It's a simple way to step around the above problems.

[1] https://github.com/flatpak/xdg-desktop-portal/pull/348

flatpak-xdg-utils.spec

@@ -1,7 +1,7 @@
 Name:     flatpak-xdg-utils
 Summary:  Command-line tools for use inside Flatpak sandboxes
 Version:  1.0.0
-Release:  3%{?dist}
+Release:  4%{?dist}
 License:  LGPLv2+
 URL:      https://github.com/flatpak/flatpak-xdg-utils
 Source:   https://github.com/flatpak/%{name}/releases/download/%{version}/%{name}-%{version}.tar.xz
@@ -10,10 +10,22 @@ BuildRequires:  gcc
 BuildRequires:  meson
 BuildRequires:  pkgconfig(glib-2.0)
 
+Requires: flatpak-spawn%{?_isa} = %{?epoch:%{epoch}:}%{version}-%{release}
+
 %description
 This package contains a number of command-line utilities for use inside
 Flatpak sandboxes. They work by talking to portals.
 
+%package flatpak-spawn
+Summary:   Command-line frontend for the org.freedesktop.Flatpak service
+License:   LGPLv2+
+Conflicts: flatpak-xdg-utils < 1.0.0-4
+
+%description flatpak-spawn
+This package contains the flatpak-spawn command-line utility. It can be
+used to talk to the org.freedesktop.Flatpak service to spawn new sandboxes,
+run commands on the host, or use one of the session or system helpers.
+
 %prep
 %autosetup
 
@@ -27,10 +39,17 @@ Flatpak sandboxes. They work by talking to portals.
 %files
 %doc README.md
 %license COPYING
+%{_bindir}/xdg-email
+%{_bindir}/xdg-open
 
-%{_bindir}/*
+%files flatpak-spawn
+%license COPYING
+%{_bindir}/flatpak-spawn
 
 %changelog
+* Fri Sep 13 2019 Debarshi Ray <rishi@fedoraproject.org> - 1.0.0-4
+- Split flatpak-spawn into a separate sub-package
+
 * Thu Jul 25 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.0.0-3
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild