[balsa] Clean up generated marshalling files

[Peter Bloomfield <peterb src gnome org>]

commit 2cc2de5195a5b677dbbb835465ec1db1c45d5fb1
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sat Feb 10 21:53:20 2018 -0500

    Clean up generated marshalling files
    
    * libbalsa/Makefile.am: create a CLEANFILES variable to arrange
      for libbalsa-marshal.[ch] to be removed with "make clean".

 ChangeLog            |    7 +++++++
 libbalsa/Makefile.am |    2 ++
 2 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index c9935e7..f88b7ea 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2018-02-10  Peter Bloomfield  <pbloomfield bellsouth net>
+
+       Clean up generated marshalling files
+
+       * libbalsa/Makefile.am: create a CLEANFILES variable to arrange
+       for libbalsa-marshal.[ch] to be removed with "make clean".
+
 2018-02-09  Peter Bloomfield  <pbloomfield bellsouth net>
 
        In glib-2.56, g_object_ref() propagates the type from its argument
diff --git a/libbalsa/Makefile.am b/libbalsa/Makefile.am
index a31936a..d6e0178 100644
--- a/libbalsa/Makefile.am
+++ b/libbalsa/Makefile.am
@@ -182,4 +182,6 @@ libbalsa-marshal.c: libbalsa-marshal.h
        && mv libbalsa-marshal.tmp libbalsa-marshal.c ) \
        || ( rm -f libbalsa-marshal.tmp && exit 1 )
 
+CLEANFILES = libbalsa-marshal.c libbalsa-marshal.h
+
 $(libbalsa_a_OBJECTS): libbalsa-marshal.h