SVN: fix incorrect SOURCESVN_VERSION_REQUIRED

Caused integration plugins derived from SourceSVN, i.e.
- Source Subversion / SourceForge (SourceSFSVN)
- Source VisualSVN Server (SourceVisualSVNServer)
- Source Subversion / WebSVN (SourceWebSVN)
- Source Subversion / ViewVC (SourceViewVC)

to show Source Subversion Integration as an outdated dependency in the
Manage Plugins page.

Fixes #388

Author: dregad

SourceSFSVN/SourceSFSVN.php

@@ -11,7 +11,7 @@ class SourceSFSVNPlugin extends SourceSVNPlugin {
 
 	const PLUGIN_VERSION = '2.1.0';
 	const FRAMEWORK_VERSION_REQUIRED = '2.5.0';
-	const SOURCESVN_VERSION_REQUIRED = '2.5.0';
+	const SOURCESVN_VERSION_REQUIRED = '2.4.0';
 
 	public $type = 'sfsvn';
 

SourceViewVC/SourceViewVC.php

@@ -12,7 +12,7 @@ class SourceViewVCPlugin extends SourceSVNPlugin {
 
 	const PLUGIN_VERSION = '2.1.0';
 	const FRAMEWORK_VERSION_REQUIRED = '2.5.0';
-	const SOURCESVN_VERSION_REQUIRED = '2.5.0';
+	const SOURCESVN_VERSION_REQUIRED = '2.4.0';
 
 	public $type = 'viewvc';
 

SourceVisualSVNServer/SourceVisualSVNServer.php

@@ -13,7 +13,7 @@ class SourceVisualSVNServerPlugin extends SourceSVNPlugin {
 
 	const PLUGIN_VERSION = '2.1.0';
 	const FRAMEWORK_VERSION_REQUIRED = '2.5.0';
-	const SOURCESVN_VERSION_REQUIRED = '2.5.0';
+	const SOURCESVN_VERSION_REQUIRED = '2.4.0';
 
 	public $type = 'vsvns';
 

SourceWebSVN/SourceWebSVN.php

@@ -11,7 +11,7 @@ class SourceWebSVNPlugin extends SourceSVNPlugin {
 
 	const PLUGIN_VERSION = '2.1.0';
 	const FRAMEWORK_VERSION_REQUIRED = '2.5.0';
-	const SOURCESVN_VERSION_REQUIRED = '2.5.0';
+	const SOURCESVN_VERSION_REQUIRED = '2.4.0';
 
 	public $type = 'websvn';