[sysprof] build: ensure COPYING.gpl-2 is bundled in tarballs

[Christian Hergert <chergert src gnome org>]

commit a85bd6e41f1597c955162b4b3b332a23362f5e1b
Author: Christian Hergert <christian hergert me>
Date:   Mon Apr 18 18:53:26 2016 -0700

    build: ensure COPYING.gpl-2 is bundled in tarballs

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index e2d345d..b919a3f 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,6 +1,6 @@
 SUBDIRS = daemon data help lib po src tools tests
 
-EXTRA_DIST = AUTHORS tap-test
+EXTRA_DIST = AUTHORS tap-test COPYING.gpl-2
 
 DISTCHECK_CONFIGURE_FLAGS = --with-systemdsystemunitdir='$(prefix)/etc/systemd/system'