[gnome-builder] vala: follow automake conventions for vala stamp files

[Christian Hergert <chergert src gnome org>]

commit 2d7f4230d3ff061172fb1c27e4cbbfc962a44b97
Author: Christian Hergert <christian hergert me>
Date:   Thu Apr 28 18:46:49 2016 -0700

    vala: follow automake conventions for vala stamp files

 plugins/vala-pack/Makefile.am |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/plugins/vala-pack/Makefile.am b/plugins/vala-pack/Makefile.am
index 005b35e..ee14f93 100644
--- a/plugins/vala-pack/Makefile.am
+++ b/plugins/vala-pack/Makefile.am
@@ -15,9 +15,9 @@ plugindir = $(libdir)/gnome-builder/plugins
 plugin_LTLIBRARIES = libvala-pack-plugin.la
 dist_plugin_DATA = vala-pack.plugin
 
-BUILT_SOURCES = libvala_pack_plugin_la.stamp
+BUILT_SOURCES = libvala_pack_plugin_la_vala.stamp
 
-libvala_pack_plugin_la.stamp: $(libvala_pack_plugin_la_VALASOURCES)
+libvala_pack_plugin_la_vala.stamp: $(libvala_pack_plugin_la_VALASOURCES)
        $(AM_V_GEN)$(VALAC) \
                $(libvala_pack_plugin_la_VALAFLAGS) \
                $(addprefix $(srcdir)/,$(libvala_pack_plugin_la_VALASOURCES)) \