[rygel] build: Fix stem rule for xml files

[Jens Georg <jensgeorg src gnome org>]

commit 26264ddd4052e2e7e9f2d9aa5b6fa2eac1e790c3
Author: Matteo Settenvini <matteo member fsf org>
Date:   Thu Feb 16 12:34:35 2017 -0300

    build: Fix stem rule for xml files
    
    Some of the xml files are generated a first time from the configure
    script in the build folder, and hence were not found by the
    previous stemming.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778829

 data/xml/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/xml/Makefile.am b/data/xml/Makefile.am
index 5fe4f1f..d68e460 100644
--- a/data/xml/Makefile.am
+++ b/data/xml/Makefile.am
@@ -15,7 +15,7 @@ xml_in_files = EnergyManagement.xml.in \
 xml_DATA = $(xml_in_files:.xml.in=.xml)
 
 # Strip newlines and leading spaces from XML files as not all devices like them
-%.xml: $(srcdir)/%.xml.in
+%.xml: %.xml.in
        @cat < $< | sed -re "s,^ +,,g" | tr -d "\n" > $@
 
 xmldir = $(datadir)/rygel/xml