The X Test Suite's XDisplayString test checks the invariant
XDisplayString(XOpenDisplay(str)) == str.  The Xlib XOpenDisplay violates this
invariant by expanding str to the canonical form "host:display.scrn" (unless
HAVE_LAUNCHD is set and it starts with "/tmp/launch").  E.g., this expands ":1"
to ":1.0":

  400|26 1 1 19:26:41|IC Start
  200|26 1 19:26:41|TP Start
  520|26 1 00032625 1 1|VSW5TESTSUITE PURPOSE 1
  520|26 1 00032625 1 2|Assertion XDisplayString-1.(A)
  520|26 1 00032625 1 3|A call to XDisplayString returns the string that was used
  520|26 1 00032625 1 4|as the argument to the XOpenDisplay call that returned the
  520|26 1 00032625 1 5|value used as the display argument.
  520|26 1 00032625 1 6|METH: Open a connection using XOpenDisplay.
  520|26 1 00032625 1 7|METH: Obtain the display string using XDisplayString.
  520|26 1 00032625 1 8|METH: Verify that the value of the string is the parameter used in XOpenDisplay.
  520|26 1 00032625 1 9|METH: Close the display using XCloseDisplay.
  520|26 1 00032625 1 10|REPORT: XDisplayString() returned ":1.0" instead of ":1".
  220|26 1 1 19:26:41|FAIL
  410|26 1 1 19:26:41|IC End

Fix this by deleting all of the code to construct the canonical path and just
stashing a copy of the original display_name in dpy->display_name.

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Jeremy Huddleston <jeremyhu@apple.com>