Ignore ctm param of SkShader::onAppendStages()

Clang 3.8.0:

../../include/core/SkShader.h:513:49: error: unused parameter 'ctm' [-Werror,-Wunused-parameter]
                                const SkMatrix& ctm) const {


R=mtklein@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4867

Change-Id: I242180cb33ad099b28b06654934029690da195ee
Reviewed-on: https://skia-review.googlesource.com/4867
Commit-Queue: Florin Malita <fmalita@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
1 file changed