Repaired Doxygen's old path to providers and plugins

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@5167 c8812cc2-4d05-0410-92ff-de0c093fc19c

doxygen.conf

@@ -301,7 +301,7 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories 
 # with spaces.
 
-INPUT                  = ./src ./plugins ./providers
+INPUT                  = ./src
 
 # If the value of the INPUT tag contains directories, you can use the 
 # FILE_PATTERNS tag to specify one or more wildcard pattern (like *.cpp