disable 'git_update' mode

Dan Streetmanrequested to merge
ddstreet/qemu:debian_git_update into master

The configure script has a 'git_update' mode, that we do not want to actually use, as we don't want to pull code from remote git repos at build time. This adds --disable-git-update as well as adding a patch to configure and Makefile to actually disable 'git_update' when --disable-git-update is used.

LP: #1887535

Signed-off-by: Dan Streetman ddstreet@canonical.com

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