Python: Add include to the generated log list header
Python: Add include to the generated log list header

The stddef header was added in https://codereview.chromium.org/1535363003,
this commit reflects this change in the generated header.

taknira/certificate-transparency,katjoyce/certificate-transparency,pphaneuf/certificate-transparency,eranmes/certificate-transparency,RJPercival/certificate-transparency,google/certificate-transparency,lexibrent/certificate-transparency,eranmes/certificate-transparency,katjoyce/certificate-transparency,lexibrent/certificate-transparency,AlCutter/certificate-transparency,eranmes/certificate-transparency,benlaurie/certificate-transparency,katjoyce/certificate-transparency,google/certificate-transparency,katjoyce/certificate-transparency,katjoyce/certificate-transparency,benlaurie/certificate-transparency,phad/certificate-transparency,AlCutter/certificate-transparency,pphaneuf/certificate-transparency,taknira/certificate-transparency,phad/certificate-transparency,eranmes/certificate-transparency,eranmes/certificate-transparency,katjoyce/certificate-transparency,benlaurie/certificate-transparency,google/certificate-transparency,pphaneuf/certificate-transparency,taknira/certificate-transparency,AlCutter/certificate-transparency,eranmes/certificate-transparency,RJPercival/certificate-transparency,AlCutter/certificate-transparency,katjoyce/certificate-transparency,taknira/certificate-transparency,grandamp/certificate-transparency,lexibrent/certificate-transparency,phad/certificate-transparency,phad/certificate-transparency,grandamp/certificate-transparency,google/certificate-transparency,pphaneuf/certificate-transparency,taknira/certificate-transparency,benlaurie/certificate-transparency,RJPercival/certificate-transparency,AlCutter/certificate-transparency,grandamp/certificate-transparency,AlCutter/certificate-transparency,lexibrent/certificate-transparency,RJPercival/certificate-transparency,grandamp/certificate-transparency,benlaurie/certificate-transparency,AlCutter/certificate-transparency,benlaurie/certificate-transparency,eranmes/certificate-transparency,benlaurie/certificate-transparency,taknira/certificate-transparency,taknira/certificate-transparency