depexp: Improve wording on requirements

Since -g is required, tell the user exactly so.

Signed-off-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
HOB: HIG compliant message dialogs

"More" HIG compliant dialogs for HOB.

Signed-off-by: Valentin Popa <valentin.popa@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>