ocaml-react: Switch to GitHub mirror

Signed-off-by: Euan Harris <euan.harris@citrix.com>
ocaml-cmdliner: Switch to GitHub mirror

Signed-off-by: Euan Harris <euan.harris@citrix.com>
ocaml-uuidm: Switch to GitHub mirror

Signed-off-by: Euan Harris <euan.harris@citrix.com>
ocaml-uutf: Switch to GitHub mirror

Signed-off-by: Euan Harris <euan.harris@citrix.com>
xmlm: Switch to GitHub mirror

Signed-off-by: Euan Harris <euan.harris@citrix.com>
Merge pull request #435 from euanh/use-github-mirrors

Use github mirrors