Revert r1461775.
Discussion: http://svn.haxx.se/dev/archive-2013-05/0357.shtml

* subversion/include/svn_error.h
  (SVN_ERR_ASSERT): Re-implement macro without using SVN_ERR_ASSERT_E to 
   workaround pre-processor issues in VC10.
 

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1484755 13f79535-47bb-0310-9956-ffa450edef68