Use upstream git as the source of gdb

      Test: Dry-run works.

PRESUBMIT=passed
R=cmtice,bjanakiraman,shenhan,asharif
APPROVED=shenhan
DELTA=3 (0 added, 0 deleted, 3 changed)
OCL=43512237


P4 change: 43556520
1 file changed
tree: 5b71ccd51ea299909faa473a5e77d5f45d008837
  1. .git5_specs/
  2. v14/