Update subsurface-libdc to 4.9.3
Summary:
Update subsurface-libdc to 4.9.3
No changelog available.
Packaging change: Switch to github source
Test Plan: Succesfully built and ran Subsurface with this version
Reviewers: Triage Team, DataDrake
Reviewed By: Triage Team, DataDrake
Subscribers: DataDrake
Differential Revision: https://dev.getsol.us/D8458