[mobile-broadband-provider-info] build: fix make distcheck

[Lubomir Rintel <lkundrak src gnome org>]

commit 19260901073984348f4a84917e8fe97f02439e71
Author: Lubomir Rintel <lkundrak v3 sk>
Date:   Wed Apr 10 19:12:47 2019 +0200

    build: fix make distcheck

 Makefile.am | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/Makefile.am b/Makefile.am
index c023a6a..52aa99c 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -4,7 +4,10 @@ SP_XML_DB = serviceproviders.xml
 
 dist_pkgdata_DATA = $(SP_XML_DB) serviceproviders.2.dtd
 
-EXTRA_DIST = mobile-broadband-provider-info.pc.in
+EXTRA_DIST = mobile-broadband-provider-info.pc.in \
+       apns-conf.xsl
+
+CLEANFILES = apns-conf.xml
 
 pkgconfigdir = $(datadir)/pkgconfig
 pkgconfig_DATA = mobile-broadband-provider-info.pc