Exclude ppc64le and s390x when including dri package.

Exclude gpu support since these platforms only need to build
gn, which doesn't need graphic support.

Change-Id: I74702eb03e6b73d38540560f03cf4d95543f0c1c
Reviewed-on: https://chromium-review.googlesource.com/897684Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533923}

content/gpu/BUILD.gn

@@ -122,7 +122,8 @@ target(link_target_type, "gpu_sources") {
   }
 
   # Use DRI on desktop Linux builds.
-  if (is_desktop_linux && (!is_chromecast || is_cast_desktop_build)) {
+  if (current_cpu != "s390x" && current_cpu != "ppc64le" && is_desktop_linux &&
+      (!is_chromecast || is_cast_desktop_build)) {
     configs += [ "//build/config/linux/dri" ]
   }
 }