Commit this code before another patch becomes to difficult to follow.

  This patch does one thing, it changes the root path "/" to reflect an
  element count of Zero (0).  directory_walk will always accept the zero
  element (which sorts first, thankfully) on it's first go around.

  So, Unix will accept "/" when it's parsing it's first element "/".

  Dos/Win32 will accept "/" and "C:/" when they parse their first element,
  "C:/".  The root sorted first, so it behaves as users expect.

  The syntax "//" or "//machine" will be depreciated for now, the user
  needs to set up the extact "//machine/share/" that they want served
  on Win32.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@90644 13f79535-47bb-0310-9956-ffa450edef68