pidgin/pidgin

Fix some ggp_xml stuff

2020-08-22, Elliott Sales de Andrade
eae11ccb1bef
Fix some ggp_xml stuff

Fix const-ness of ggp_xml functions.
Fix some leaks in GG XML string usage.

Testing Done:
Compile only.

Reviewed at https://reviews.imfreedom.org/r/84/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "pidgin/pidgin"
REPOSITORY_TYPE = "mercurial"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False