Restore INC_PR to r15 to prevent breakage with out of tree openssl
recipes (e.g, meta-oe).
(From OE-Core rev: 370b186b7c39897b868a5e3798a11a285277f145)
Signed-off-by: Scott Garman <scott.a.garman@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>