Commit protoc 3.9.1 prebuilts from github. am: 7f770bcfc8

Original change: https://android-review.googlesource.com/c/platform/prebuilts/protobuf/+/1323672

Change-Id: I5e1e5631c592c8eeb9b6c5b8f1871824fe7dabff
diff --git a/README.txt b/README.txt
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+This project contains prebuilt binaries of the protocol buffer compiler.
+
+protoc is tightly coupled to the source code of libprotobuf-cpp, which is compiled from the sources in external/protobuf.
+
+Therefore, the contents of this folder should match the contents of external/protobuf.
+
+Download source: official protoc artifacts
+URL: https://github.com/protocolbuffers/protobuf/releases/tag/v3.9.1
diff --git a/darwin-x86_64/protoc b/darwin-x86_64/protoc
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diff --git a/linux-x86_64/protoc b/linux-x86_64/protoc
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diff --git a/windows-x86/protoc.exe b/windows-x86/protoc.exe
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