windows: define PRIx8

Define PRIx8 in inttypes.h on windows if it is not provided by the system.

Change-Id: I33f2cc234d2ce012d65a7bb68a0d8793fd0f3c2e
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
pttc: initialize qmark_size

Some compilers complain about a potential uninitialized use of qmark_size.

This is a false positive since qmark_size is only used if qmark_padding is
non-zero and hence qmark_size is initialized.

Nevertheless, initialize it.

Change-Id: Ifae0dd07ec4859c18ba7f03782184bfd939d8f8a
Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>