Fixes UEdin builds after wasm-integration merge

A bug which crept in during manual merge is now fixed. PCItem -> Batch
on a PCQueue.

docs/marian-integration.md provides instructions to compile successfully
for multithread.

doc/marian-integration.md

@@ -10,7 +10,9 @@ $ git clone https://github.com/browsermt/bergamot-translator
 $ cd bergamot-translator
 $ mkdir build
 $ cd build
-$ cmake ../
+$ cmake .. -DCOMPILE_CUDA=off -DCMAKE_BUILD_TYPE=Release \
+    -DCOMPILE_DECODER_ONLY=off -DCOMPILE_LIBRARY_ONLY=off -DUSE_MKL=on \
+    -DCOMPILE_THREAD_VARIANT=on
 $ make -j
 
 

src/translator/batch_translator.h

@@ -47,7 +47,6 @@ private:
   Ptr<data::ShortlistGenerator const> slgen_;
 
 #ifdef WITH_PTHREADS
-  PCQueue<PCItem> *pcqueue_;
   std::thread thread_;
 #endif
 };