Make 'svn status' ignore the thumbs.db files by default, which are 
created by the Windows explorer.

* subversion/include/svn_config.h
  (SVN_CONFIG__DEFAULT_GLOBAL_IGNORES_LINE_2): Add [Th]umbs.db.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1620955 13f79535-47bb-0310-9956-ffa450edef68