.gitmodules

The other submodules default to http for users behind firewalls.

Change-Id: I58fce00478ec6c94f75992f4e8f0c24f556abe61
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/3172
Tested-by: jenkins