relnotes: add fedora's bugzilla url for the browser fix

Signed-off-by: David Aguilar <davvid@gmail.com>
contrib/build-git-cola.sh: chain calls for safety

Avoid rm -rf and chain all actions so that we stop building on errors.
Group the subdir operations so that we can avoid the need for
$compile_top.

Signed-off-by: David Aguilar <davvid@gmail.com>