[pix_opencv] Update README to new sf.net repo url

update_sf.net_repo_url.diff

Index: README.txt
===================================================================
--- README.txt	(revision 17158)
+++ README.txt	(working copy)
@@ -2,7 +2,7 @@
 
 get the source version through svn :
 
-svn co https://pure-data.svn.sourceforge.net/svnroot/pure-data pure-data
+svn co https://svn.code.sf.net/p/pure-data/svn pure-data
 cd pure-data/trunk/externals/pix_opencv
 
 you need a working build toolchain
@@ -19,7 +19,7 @@
 # http://opencv.willowgarage.com/wiki/InstallGuide
 
 # get the source : 
-svn co https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk/externals/pix_opencv pix_opencv
+svn co https://svn.code.sf.net/p/pure-data/svn/trunk/externals/pix_opencv
 
 cd pix_opencv
 make 
@@ -35,7 +35,7 @@
 # http://opencv.willowgarage.com/wiki/InstallGuide
 
 # then get the sources and compile :
-svn co https://pure-data.svn.sourceforge.net/svnroot/pure-data/trunk/externals/pix_opencv pix_opencv
+svn co https://svn.code.sf.net/p/pure-data/svn/trunk/externals/pix_opencv
 cd pix_opencv
 make PD_PATH=/path/to/pdextended-app/Contents/Resources/