Add explicit girdir and typelib_dir when building flatpak

When using this library in connection with flatpak, girdr and typelib_dir
must be explicit in configure section, because of pkg-config, which doesn't
recognize the paths correctly.
When building library without %{flatpak} macro set, there is no change.

libgsf.spec

@@ -1,7 +1,7 @@
 Summary: GNOME Structured File library
 Name: libgsf
 Version: 1.14.43
-Release: 5%{?dist}
+Release: 6%{?dist}
 License: LGPLv2
 Source: ftp://ftp.gnome.org/pub/GNOME/sources/%{name}/1.14/%{name}-%{version}.tar.xz
 URL: http://www.gnome.org/projects/libgsf/
@@ -36,6 +36,9 @@ libgsf.
 
 %build
 %configure --disable-gtk-doc --disable-static --enable-introspection=yes
+%if 0%{?flatpak}
+--with-typelib_dir=%{_libdir}/girepository-1.0 --with-gir-dir=%{_datadir}/gir-1.0
+%endif
 
 make %{?_smp_mflags} V=1
 
@@ -75,6 +78,9 @@ find %{buildroot} -name '*.la' -exec rm -f {} ';'
 %{_mandir}/man1/gsf-vba-dump.1*
 
 %changelog
+* Wed Aug 8 2019 Jan Beran <jaberan@redhat.com> - 1.14.43-6
+- Add explicit path for girdir and typelib_dir when building flatpak 
+
 * Thu Jul 25 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.14.43-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild