Patch signond 8.60 while waiting on new release

Summary:
Patch version 8.60 while waiting on new release (should be in next couple of weeks)

Patches

• Don't use -fno-rtti
• Port away from QHash::unite

Test Plan: Successfully added Google account via systemsettings5

Reviewers: Triage Team, Girtablulu

Reviewed By: Triage Team, Girtablulu

Subscribers: Girtablulu

Differential Revision: https://dev.getsol.us/D9962