fix(build): add a dependency to the build directory

The build directory is never explicitly depended on. Other recipes are
pretty much guaranteed to finish before the sp_layout target requires
it. However, on extremely slow hard drives (1MB/s) that doesn't happen.
Add an explicit dependency so make waits correctly.

Change-Id: Ibafc696c27c1a1ed14d181ef330871f6539c45f7
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>
1 file changed