Get rid of "use X11 if it's installed" deps

Closes #28096.
Revert "Audit gnome URLs, prefer download.gnome.org"

This reverts commit 557ef8df05a8ea28ed903f08b2009ebc0e218f5a.
Revert "Use download.gnome.org instead of ftp.gnome.org"

This reverts commit 90575346225fd0c16475ad74ee53b37b62715f0c.

Closes #28026.