deps/Makefile: fix ECLIPSEGIT2 clone URL

Switch to working clone URL, after more repositories stopped working
with the old URL. Revert 865ba37553609a07f714aadfa54b91b5e6771680
("deps: Work around disappearing eclipse.org git repositories").

Related: https://bugs.eclipse.org/bugs/show_bug.cgi?id=559943
Change-Id: I04b690a262765f60b671225e1a5425e2750d093f
1 file changed