No gpgmepp in org.gnome.Sdk//3.20

Change-Id: I4ca06ca42bd48151fcee4a0f22ebdaef4a797e6a
diff --git a/distro-configs/LibreOfficeFlatpak.conf b/distro-configs/LibreOfficeFlatpak.conf
index d85e8ea..5440353 100644
--- a/distro-configs/LibreOfficeFlatpak.conf
+++ b/distro-configs/LibreOfficeFlatpak.conf
@@ -12,6 +12,7 @@
--without-system-cppunit
--without-system-firebird
--without-system-glm
--without-system-gpgmepp
--without-system-libabw
--without-system-libcdr
--without-system-libcmis