[ocp] add instructions for building Source0 snapshot tarball

[Charles R. Anderson]

commit 07392151715eee1107a74337954e1629c13dfce4
Author: Charles R. Anderson <cra at wpi.edu>
Date:   Tue Feb 24 01:46:56 2015 -0500

    add instructions for building Source0 snapshot tarball

 ocp.spec | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/ocp.spec b/ocp.spec
index 9fda19e..94f2d2a 100644
--- a/ocp.spec
+++ b/ocp.spec
@@ -13,6 +13,9 @@ Group: Applications/Multimedia
 License: GPLv2+ and CC-BY
 URL: http://stian.cubic.org/project-ocp.php
 #Source0: http://stian.cubic.org/ocp/ocp-%{version}.tar.bz2
+# To make Source0 snapshot:
+# git clone git://git.code.sourceforge.net/p/opencubicplayer/code ocp-0.1.22-20150223gitbceb98e
+# tar cvjf ocp-0.1.22-20150223gitbceb98e.tar.gz ocp-0.1.22-20150223gitbceb98e
 Source0: ocp-%{version}-%{checkout}.tar.bz2
 Source1: ftp://ftp.cubic.org/pub/player/gfx/opencp25image1.zip
 Source2: ftp://ftp.cubic.org/pub/player/gfx/opencp25ani1.zip