Don't build the nautilus subpackage in a module

It doesn't make sense. One flatpak can't extend another.

file-roller.spec

@@ -12,7 +12,9 @@ BuildRequires:  gcc
 BuildRequires:  pkgconfig(glib-2.0) >= 2.36
 BuildRequires:  pkgconfig(gthread-2.0)
 BuildRequires:  pkgconfig(gtk+-3.0) >= 3.13.2
+%if 0%{?flatpak}
 BuildRequires:  pkgconfig(libnautilus-extension) >= 2.22.2
+%endif
 BuildRequires:  pkgconfig(json-glib-1.0) >= 0.14.0
 BuildRequires:  pkgconfig(libnotify) >= 0.4.3
 BuildRequires:  pkgconfig(libarchive) >= 3.0.0
@@ -27,6 +29,7 @@ BuildRequires:  /usr/bin/appstream-util
 File Roller is an application for creating and viewing archives files,
 such as tar or zip files.
 
+%if 0%{?flatpak}
 %package nautilus
 Summary: File Roller extension for nautilus
 Requires: %{name}%{_isa} = %{version}-%{release}
@@ -35,6 +38,7 @@ Requires: %{name}%{_isa} = %{version}-%{release}
 This package contains the file-roller extension for the nautilus file manager.
 It adds an item to the nautilus context menu that lets you compress files
 or directories.
+%endif
 
 %prep
 %setup -q
@@ -66,12 +70,15 @@ desktop-file-validate %{buildroot}%{_datadir}/applications/org.gnome.FileRoller.
 %{_datadir}/glib-2.0/schemas/org.gnome.FileRoller.gschema.xml
 %{_datadir}/metainfo/org.gnome.FileRoller.appdata.xml
 
+%if 0%{?flatpak}
 %files nautilus
 %{_libdir}/nautilus/extensions-3.0/libnautilus-fileroller.so
+%endif
 
 %changelog
 * Tue Oct  2 2018 Matthias Clasen <mclasen@redhat.com> - 3.30.1-2
 - Avoid gratitious use of %{_bindir}. This breaks module builds
+- Don't build the nautilus subpackage when doing a module
 
 * Wed Sep 26 2018 Kalev Lember <klember@redhat.com> - 3.30.1-1
 - Update to 3.30.1