Add external repo patches to support bare-metal build

Disable thread library dependency

Change-Id: Id43491d30356dacace5e2f894b7661759c2806ce

tensorflow/workspace.bzl

diff --git a/tensorflow/workspace.bzl b/tensorflow/workspace.bzl
index b799523..597dc14 100644
--- a/tensorflow/workspace.bzl
+++ b/tensorflow/workspace.bzl
@@ -35,6 +35,8 @@
             "https://storage.googleapis.com/mirror.tensorflow.org/github.com/google/gemmlowp/archive/fda83bdc38b118cc6b56753bd540caa49e570745.zip",
             "https://github.com/google/gemmlowp/archive/fda83bdc38b118cc6b56753bd540caa49e570745.zip",
         ],
+        patch_file =
+            "@tflite-micro//third_party/gemmlowp:pthread.patch",
     )
 
     tf_http_archive(

third_party/gemmlowp/BUILD

diff --git a/third_party/gemmlowp/BUILD b/third_party/gemmlowp/BUILD
new file mode 100644
index 0000000..c9776cc
--- /dev/null
+++ b/third_party/gemmlowp/BUILD
@@ -0,0 +1,6 @@
+package(
+    default_visibility = ["//visibility:public"],
+    licenses = ["notice"],
+)
+
+exports_files(glob(["*.patch"]))

third_party/gemmlowp/pthread.patch

diff --git a/third_party/gemmlowp/pthread.patch b/third_party/gemmlowp/pthread.patch
new file mode 100644
index 0000000..547dd52
--- /dev/null
+++ b/third_party/gemmlowp/pthread.patch
@@ -0,0 +1,13 @@
+diff --git a/flags.bzl b/flags.bzl
+index e35fe9e..e26a448 100644
+--- a/flags.bzl
++++ b/flags.bzl
+@@ -4,7 +4,7 @@ LIB_COPTS = []
+ LIB_LINKOPTS = select({
+     ":android": [],
+     ":windows": [],
+-    "//conditions:default": ["-lpthread"],
++    "//conditions:default": [],
+ })
+ 
+ BIN_LINKOPTS = LIB_LINKOPTS
\ No newline at end of file

third_party/ruy/BUILD

diff --git a/third_party/ruy/BUILD b/third_party/ruy/BUILD
index 4c36181..8db906a 100644
--- a/third_party/ruy/BUILD
+++ b/third_party/ruy/BUILD
@@ -5,4 +5,4 @@
     licenses = ["notice"],
 )
 
-exports_files(["LICENSE"])
+exports_files(glob(["*.patch"]) + ["LICENSE"])

third_party/ruy/pthread.patch

diff --git a/third_party/ruy/pthread.patch b/third_party/ruy/pthread.patch
new file mode 100644
index 0000000..c8ddf4d
--- /dev/null
+++ b/third_party/ruy/pthread.patch
@@ -0,0 +1,11 @@
+diff --git a/ruy/build_defs.oss.bzl b/ruy/build_defs.oss.bzl
+index e405b41..1d7612b 100644
+--- a/ruy/build_defs.oss.bzl
++++ b/ruy/build_defs.oss.bzl
+@@ -11,5 +11,5 @@ def ruy_linkopts_thread_standard_library():
+     # https://github.com/abseil/abseil-cpp/blob/1112609635037a32435de7aa70a9188dcb591458/absl/base/BUILD.bazel#L155
+     return select({
+         "@bazel_tools//src/conditions:windows": [],
+-        "//conditions:default": ["-pthread"],
++        "//conditions:default": [],
+     })
\ No newline at end of file

third_party/ruy/workspace.bzl

diff --git a/third_party/ruy/workspace.bzl b/third_party/ruy/workspace.bzl
index 5076962..1671ab5 100644
--- a/third_party/ruy/workspace.bzl
+++ b/third_party/ruy/workspace.bzl
@@ -12,4 +12,5 @@
             "https://github.com/google/ruy/archive/54774a7a2cf85963777289193629d4bd42de4a59.zip",
         ],
         build_file = "//third_party/ruy:BUILD",
+        patch_file = "@tflite-micro//third_party/ruy:pthread.patch",
     )