libipt, section: remove unnecessary dependency

The pt_section.h header depends on stdio.h.  This is not necessary.  The actual
dependency is only for pt_section_file.c and ptunit-section.c.  Move include.

Change-Id: I0e0d67e22c6eddf4204939f0c23fbcdb04bbc85b
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
libipt, image: remove unused pt_image_is_empty()

Change-Id: Ibb6dd872abbf3f3b6853160f945da688b4cfc476
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>