Fix Android x86_64 build (pytorch#5434)

Summary: Pull Request resolved: pytorch#5434

Reviewed By: dbort

Differential Revision: D62892393

Pulled By: kirklandsign

fbshipit-source-id: 32cc89511d188438259def4d7b36d034eaa1ef15

Author: kirklandsign

build/Utils.cmake

@@ -187,6 +187,8 @@ function(extract_sources sources_file)
     if(ANDROID_ABI)
       if("${ANDROID_ABI}" STREQUAL "arm64-v8a")
         set(target_platforms_arg "--target-platforms=shim//:android-arm64")
+      elseif("${ANDROID_ABI}" STREQUAL "x86_64")
+        set(target_platforms_arg "--target-platforms=shim//:android-x86_64")
       else()
         message(FATAL_ERROR "Unsupported ANDROID_ABI setting ${ANDROID_ABI}. Please add it here!")
       endif()

shim/BUCK

@@ -65,3 +65,12 @@ execution_platform(
     use_windows_path_separators = host_info().os.is_windows,
     visibility = ["PUBLIC"],
 )
+
+execution_platform(
+    name = "android-x86_64",
+    cpu_configuration = "prelude//cpu:x86_64",
+    os_configuration = "prelude//os:android",
+    # REVIEW: not sure if this is correct
+    use_windows_path_separators = host_info().os.is_windows,
+    visibility = ["PUBLIC"],
+)