remove outdated TODO from skia external

Change-Id: Ibe17072dd0c1f4b7f76d05a2dac0e2cbf1eb151d
diff --git a/external/skia/UnpackedTarball_skia.mk b/external/skia/UnpackedTarball_skia.mk
index 4d38ba8..33fcf05 100644
--- a/external/skia/UnpackedTarball_skia.mk
+++ b/external/skia/UnpackedTarball_skia.mk
@@ -11,7 +11,6 @@ $(eval $(call gb_UnpackedTarball_UnpackedTarball,skia))

$(eval $(call gb_UnpackedTarball_set_tarball,skia,$(SKIA_TARBALL)))

# TODO
skia_patches := \
    lerp.patch \
    fix-pch.patch.1 \