protobuf-swift: revision for protobuf

Formula/protobuf-swift.rb

@@ -3,6 +3,7 @@ class ProtobufSwift < Formula
   homepage "https://github.com/alexeyxo/protobuf-swift"
   url "https://github.com/alexeyxo/protobuf-swift/archive/3.0.6.tar.gz"
   sha256 "279c24886f5a88f332db2e0f745de55b6267e697ce4ba42f7d91566b6cf11be3"
+  revision 1
 
   bottle do
     cellar :any
@@ -17,6 +18,12 @@ class ProtobufSwift < Formula
   depends_on "protobuf"
 
   def install
+    # Regenerate the generated files for protobuf 3.2.0
+    # See https://github.com/alexeyxo/protobuf-swift/issues/200
+    system "protoc", "-Iplugin/compiler",
+                     "plugin/compiler/google/protobuf/descriptor.proto",
+                     "plugin/compiler/google/protobuf/swift-descriptor.proto",
+                     "--cpp_out=plugin/compiler"
     system "./autogen.sh"
     system "./configure", "--prefix=#{prefix}"
     system "make"