Generate C# code whenever descriptor.proto changes
This is a start to fixing issue #1212. It won't help for test protos,
conformance etc, but it will definitely be better than nothing, and
would have highlighted a change in descriptor.proto which broken C#
earlier.
diff --git a/csharp/generate_protos.sh b/csharp/generate_protos.sh
index 9899097..d979aa5 100755
--- a/csharp/generate_protos.sh
+++ b/csharp/generate_protos.sh
@@ -6,7 +6,7 @@
set -ex
# cd to repository root
-cd $(dirname $0)/..
+pushd $(dirname $0)/..
# Protocol buffer compiler to use. If the PROTOC variable is set,
# use that. Otherwise, probe for expected locations under both
