gplugin/gplugin

Make sure all of the license file headers are pointing to an https link

Testing Done:
Compile and docs.

Reviewed at https://reviews.imfreedom.org/r/127/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "gplugin/gplugin"
REPOSITORY_TYPE = "mercurial"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False