[mutter] clutter: Install cally headers again when using autotools

[Jonas Ådahl <jadahl src gnome org>]

commit fc5b94e077087815892eafa4e9d4fa434de34459
Author: Jonas Ådahl <jadahl gmail com>
Date:   Wed Nov 7 11:26:54 2018 +0100

    clutter: Install cally headers again when using autotools
    
    The install step was accidentally removed.

 clutter/clutter/Makefile.am | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/clutter/clutter/Makefile.am b/clutter/clutter/Makefile.am
index 1c2d5e591..028f056e8 100644
--- a/clutter/clutter/Makefile.am
+++ b/clutter/clutter/Makefile.am
@@ -544,6 +544,9 @@ cally_sources_private = \
        cally/cally-actor-private.h     \
        $(NULL)
 
+cally_includedir = $(clutter_base_includedir)/cally
+cally_include_HEADERS = $(cally_sources_h)
+
 # general build rules:
 # you should not need to modify anything below this point