Reverts third_party/protobuf: Update to HEAD (f52e188fe4)

third_party/protobuf/csharp/buildall.sh

Index: third_party/protobuf/csharp/buildall.sh
diff --git a/third_party/protobuf/csharp/buildall.sh b/third_party/protobuf/csharp/buildall.sh
index cab3222992dd7c0c4e2c0f523ef43b94ead71283..45af705f385782dcdbeafd149cd85359aca4fb6c 100755
--- a/third_party/protobuf/csharp/buildall.sh
+++ b/third_party/protobuf/csharp/buildall.sh
@@ -1,16 +1,17 @@
 #!/bin/bash
+# Use mono to build solution and run all tests.
 
+# Adjust these to reflect the location of nunit-console in your system.
+NUNIT_CONSOLE=nunit-console
+
+# The rest you can leave intact
 CONFIG=Release
 SRC=$(dirname $0)/src
 
 set -ex
 
-echo Building relevant projects.
-dotnet build -c $CONFIG $SRC/Google.Protobuf $SRC/Google.Protobuf.Test $SRC/Google.Protobuf.Conformance
+echo Building the solution.
+xbuild /p:Configuration=$CONFIG $SRC/Google.Protobuf.sln
 
 echo Running tests.
-# Only test netcoreapp1.0, which uses the .NET Core runtime.
-# If we want to test the .NET 4.5 version separately, we could
-# run Mono explicitly. However, we don't have any differences between
-# the .NET 4.5 and netstandard1.0 assemblies.
-dotnet test -c $CONFIG -f netcoreapp1.0 $SRC/Google.Protobuf.Test
+$NUNIT_CONSOLE $SRC/Google.Protobuf.Test/bin/$CONFIG/Google.Protobuf.Test.dll