build(changelog): pretend scope-less `build` changes have the `build` scope

In response to feedback provided during review of the v2.9 changelog,
commits with the `build` type and without a scope are now treated as
though they have the `build` scope as well.

Change-Id: I9628e0faf1fcf31fe88758ad3e75ca8febf1bb36
Signed-off-by: Chris Kay <chris.kay@arm.com>
1 file changed