[gi] Add freetype2-2.0 for g-i-r includes Fixes the warnings: ../src/hb-ft.cc:810: Warning: HarfBuzz: hb_ft_face_create: argument ft_face: Unresolved type: 'FT_Face' ../src/hb-ft.cc:886: Warning: HarfBuzz: hb_ft_face_create_cached: argument ft_face: Unresolved type: 'FT_Face' ../src/hb-ft.cc:855: Warning: HarfBuzz: hb_ft_face_create_referenced: argument ft_face: Unresolved type: 'FT_Face' ../src/hb-ft.cc:920: Warning: HarfBuzz: hb_ft_font_create: argument ft_face: Unresolved type: 'FT_Face' ../src/hb-ft.cc:1029: Warning: HarfBuzz: hb_ft_font_create_referenced: argument ft_face: Unresolved type: 'FT_Face' ../src/hb-ft.cc:240: Warning: HarfBuzz: hb_ft_font_get_face: return value: Unresolved type: 'FT_Face' ../src/hb-ft.cc:262: Warning: HarfBuzz: hb_ft_font_lock_face: return value: Unresolved type: 'FT_Face'