"frame" execution of config tests precisely

the purpose is to make build log parsers able to ignore build failures
in verbose configure output.

Change-Id: I01af2e019fd1b055fdfcf6749faeebacb7a39c3f
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@theqtcompany.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>