[shotwell/wip/autotools] build: Add missing COMMON_VALAFLAGS

[Jens Georg <jensgeorg src gnome org>]

commit dcfd4c671cdb5f3d58bfd2f9886feb8f4c911d41
Author: Jens Georg <mail jensge org>
Date:   Thu Jun 30 22:23:55 2016 +0200

    build: Add missing COMMON_VALAFLAGS
    
    Signed-off-by: Jens Georg <mail jensge org>

 Makefile.am |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 1a7f099..c9fd960 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -31,6 +31,9 @@ GITIGNOREFILES = \
        gtk-doc.make \
        INSTALL \
        $(NULL)
+#
+# Generate utility library for plugins
+#
 
 lib_LTLIBRARIES = \
        plugins/common/libshotwell-plugin-common.la
@@ -44,6 +47,7 @@ $(top_srcdir)/plugins/shotwell-plugin-common.vapi: \
        plugins_common_libshotwell_plugin_common_la_vala.stamp
 
 plugins_common_libshotwell_plugin_common_la_VALAFLAGS = \
+       $(COMMON_VALAFLAGS) \
        --library publishing-support \
        --pkg gtk+-3.0 \
        --pkg json-glib-1.0 \
@@ -61,6 +65,9 @@ plugins_common_libshotwell_plugin_common_la_CFLAGS = \
 
 plugins/shotwell-plugin-dev-1.0.vapi: src_plugins_libplugin_la_vala.stamp
 
+#
+# Create intermediate library for the Plugin API
+#
 noinst_LTLIBRARIES = \
        src/plugins/libplugin.la
 
@@ -71,6 +78,7 @@ src_plugins_libplugin_la_SOURCES = \
        src/plugins/DataImportsInterfaces.vala
 
 src_plugins_libplugin_la_VALAFLAGS = \
+       $(COMMON_VALAFLAGS) \
        --pkg gio-2.0 \
        --pkg gtk+-3.0 \
        --pkg gmodule-2.0 \
@@ -80,6 +88,7 @@ src_plugins_libplugin_la_VALAFLAGS = \
        --header=plugins/shotwell-plugin-dev-1.0.h
 
 src_plugins_libplugin_la_CFLAGS = $(PLUGIN_CFLAGS)
+
 SHOTWELL_PLUGIN_LDFLAGS = \
        -no-undefined \
        -module \