Only build relocation packer for Arm and Arm64

build/all.gyp

Index: build/all.gyp
diff --git a/build/all.gyp b/build/all.gyp
index 849d891c95922d041a97c0d385ae7e6a4642ced6..2748c0ec7be9fffaf58dedc634639b5066845329 100644
--- a/build/all.gyp
+++ b/build/all.gyp
@@ -54,7 +54,6 @@
             '../chrome/chrome.gyp:chrome_shell_apk',
             '../remoting/remoting.gyp:remoting_apk',
             '../tools/telemetry/telemetry.gyp:*#host',
-            '../tools/relocation_packer/relocation_packer.gyp:relocation_packer_unittests#host',
             # TODO(nyquist) This should instead by a target for sync when all of
             # the sync-related code for Android has been upstreamed.
             # See http://crbug.com/159203
@@ -67,6 +66,11 @@
             '../sync/sync.gyp:*',
           ],
         }],
+        ['OS=="android" and (target_arch=="arm" or target_arch=="arm64")', {
+          'dependencies': [
+            '../tools/relocation_packer/relocation_packer.gyp:relocation_packer_unittests#host',
+          ],
+        }],
         ['OS!="ios" and OS!="android"', {
           'dependencies': [
             '../third_party/re2/re2.gyp:re2',