Add arm64 to libpng build configuration.

In libpng build option, neon files were missing for arm64, add "arm64" option to libpng build configuration. BUG=angleproject:4026 Change-Id: I38280c8089be93de224959583091f3a151f94ab0 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1940017Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>

Add arm64 to libpng build configuration.
6ebed542 · Xiaoxuan Liu · Commit Bot · 7fd3ad46 · 6ebed542
Commit 6ebed542 authored Nov 27, 2019 by Xiaoxuan Liu Committed by Commit Bot Nov 28, 2019
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BUILD.gn third_party/libpng/BUILD.gn +1 -1

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--- a/third_party/libpng/BUILD.gn
+++ b/third_party/libpng/BUILD.gn
@@ -24,7 +24,7 @@ static_library("libpng") {
    "src/pngwtran.c",
    "src/pngwutil.c",
  ]
-  if (target_cpu == "arm") {
+  if (target_cpu == "arm" || target_cpu == "arm64") {
    sources += [
      "src/arm/arm_init.c",
      "src/arm/filter_neon.S",