Build crashpad_client_linux.cc on Android

Bug: crashpad:30
Change-Id: I754468766c594c8de3cde6134645041f99864398
Reviewed-on: https://chromium-review.googlesource.com/922934
Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Joshua Peraza <jperaza@chromium.org>

client/client.gyp

@@ -69,6 +69,13 @@
           ],
         }],
       ],
+      'target_conditions': [
+        ['OS=="android"', {
+          'sources/': [
+            ['include', '^crashpad_client_linux\\.cc$'],
+          ],
+        }],
+      ],
       'direct_dependent_settings': {
         'include_dirs': [
           '..',