Fix BUILD.gn for arch other then x86 and x64

BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
 }
 
 skia_public_includes = [
   "include/android",
@@ skipping 126 matching lines @@
 
 utils_gypi = exec_script("gn/gypi_to_gn.py",
                          [
                            rebase_path("gyp/utils.gypi"),
                            "--replace=<(skia_include_path)=include",
                            "--replace=<(skia_src_path)=src",
                          ],
                          "scope",
                          [ "gyp/utils.gypi" ])
 
+source_set("opts_none") {
+  configs += skia_library_configs
+  sources = opts_gypi.none_sources
+}
+
 is_x86 = current_cpu == "x64" || current_cpu == "x86"
 
 if (is_x86) {
   source_set("opts_sse2") {
     configs += skia_library_configs
     sources = opts_gypi.sse2_sources
     cflags = [ "-msse2" ]
   }
 
   source_set("opts_ssse3") {
@@ skipping 35 matching lines @@
     "//third_party/zlib",
   ]
   if (is_x86) {
     deps += [
       ":opts_avx",
       ":opts_sse2",
       ":opts_sse41",
       ":opts_sse42",
       ":opts_ssse3",
     ]
+  } else {
+    deps += [ ":opts_none" ]
   }
 
   if (!is_win) {
     libs = [ "pthread" ]
   }
 
   sources = []
   sources += core_gypi.sources
   sources += effects_gypi.sources
   sources += gpu_gypi.skgpu_sources
@@ skipping 311 matching lines @@
     ":skia",
     ":tool_utils",
   ]
 }
 
 test_lib("experimental_svg_model") {
   public_include_dirs = [ "experimental/svg/model" ]
   sources = [
     "experimental/svg/model/SkSVGAttribute.cpp",
     "experimental/svg/model/SkSVGAttributeParser.cpp",
+    "experimental/svg/model/SkSVGCircle.cpp",
     "experimental/svg/model/SkSVGContainer.cpp",
-    "experimental/svg/model/SkSVGCircle.cpp",
     "experimental/svg/model/SkSVGDOM.cpp",
     "experimental/svg/model/SkSVGEllipse.cpp",
     "experimental/svg/model/SkSVGNode.cpp",
     "experimental/svg/model/SkSVGPath.cpp",
     "experimental/svg/model/SkSVGPoly.cpp",
     "experimental/svg/model/SkSVGRect.cpp",
     "experimental/svg/model/SkSVGRenderContext.cpp",
     "experimental/svg/model/SkSVGSVG.cpp",
     "experimental/svg/model/SkSVGShape.cpp",
     "experimental/svg/model/SkSVGTransformableNode.cpp",
@@ skipping 58 matching lines @@
       "tools/SkShaper_harfbuzz.cpp",
       "tools/using_skia_and_harfbuzz.cpp",
     ]
     deps = [
       ":skia",
       "//third_party/harfbuzz",
     ]
     testonly = true
   }
 }