build: patch Abseil to bring in line with upstream (#138)

Signed-off-by: Mike Schore <mike.schore@gmail.com>
Signed-off-by: JP Simard <jp@jpsim.com>

mobile/WORKSPACE

@@ -13,17 +13,20 @@ http_archive(
     urls = ["https://github.com/bazelbuild/rules_foreign_cc/archive/2b40a0098d4016f620c2ee4c10da0f46f5c90d57.tar.gz"],
 )
 
+load("@rules_foreign_cc//:workspace_definitions.bzl", "rules_foreign_cc_dependencies")
+
+# Patch upstream Abseil to prevent Foundation dependency from leaking into Android builds.
 # Workaround for https://github.com/abseil/abseil-cpp/issues/326.
-# Should be removed in https://github.com/lyft/envoy-mobile/issues/136 once resolved.
+# TODO: Should be removed in https://github.com/lyft/envoy-mobile/issues/136 once rules_android
+# supports platform toolchains.
 http_archive(
     name = "com_google_absl",
-    sha256 = "e35082e88b9da04f4d68094c05ba112502a5063712f3021adfa465306d238c76",
-    strip_prefix = "abseil-cpp-cc8dcd307b76a575d2e3e0958a4fe4c7193c2f68",
-    urls = ["https://github.com/abseil/abseil-cpp/archive/cc8dcd307b76a575d2e3e0958a4fe4c7193c2f68.tar.gz"],
+    patches = ["//bazel:abseil.patch"],
+    sha256 = "7ddf863ddced6fa5bf7304103f9c7aa619c20a2fcf84475512c8d3834b9d14fa",
+    strip_prefix = "abseil-cpp-61c9bf3e3e1c28a4aa6d7f1be4b37fd473bb5529",
+    urls = ["https://github.com/abseil/abseil-cpp/archive/61c9bf3e3e1c28a4aa6d7f1be4b37fd473bb5529.tar.gz"],
 )
 
-load("@rules_foreign_cc//:workspace_definitions.bzl", "rules_foreign_cc_dependencies")
-
 local_repository(
     name = "envoy",
     path = "envoy",

mobile/bazel/abseil.patch

@@ -0,0 +1,11 @@
+--- absl/time/internal/cctz/BUILD.bazel
++++ absl/time/internal/cctz/BUILD.bazel
+@@ -78,7 +78,7 @@ cc_library(
+     ],
+     linkopts = select({
+         ":osx": [
+-            "-framework Foundation",
++            # "-framework Foundation",
+         ],
+         ":ios": [
+             "-framework Foundation",