[grilo-plugins] build: Remove unnecessary DIST_SUBDIRS variable

[Philip Withnall <pwithnall src gnome org>]

commit ee1549cb6686802e85bed05364520da39cfb49d1
Author: Philip Withnall <philip withnall collabora co uk>
Date:   Thu May 7 11:24:29 2015 +0100

    build: Remove unnecessary DIST_SUBDIRS variable
    
    By default it is the same as SUBDIRS, so there’s no need to list it
    here.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=749063

 tests/lua-factory/Makefile.am |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/tests/lua-factory/Makefile.am b/tests/lua-factory/Makefile.am
index 6250c64..88d78a4 100644
--- a/tests/lua-factory/Makefile.am
+++ b/tests/lua-factory/Makefile.am
@@ -9,7 +9,4 @@ include $(top_srcdir)/gtester.mk
 
 SUBDIRS = sources
 
-DIST_SUBDIRS =    \
-   sources
-
 -include $(top_srcdir)/git.mk