Move skcms.h to include/third_party/skcms

Add a shim to redirect until clients are updated

Change-Id: Ib43614e5620b1a24ca18187c1646a8ed1a9ee7a4
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/211003
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
diff --git a/BUILD.gn b/BUILD.gn
index 5339658..00fda34 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -762,8 +762,9 @@
   }
 
   public = [
-    "third_party/skcms/skcms.h",
+    "include/third_party/skcms/skcms.h",
   ]
+  include_dirs = [ "include/third_party/skcms" ]
   sources = rebase_path(skcms_sources, ".", "third_party/skcms")
 }