gh-87277: Don't look for X11 browsers on macOS in webbrowser (#24480)


The installation of XQuartz on macOS will unconditionally
set the $DISPLAY variable. The X11 server will be launched
when a program tries to access the display.  This results
in launching the X11 server when using the webbrowser module,
even though X11 browsers won't be used in practice.
3 files changed