delete old bat

third_party/install.bat

-@echo off
-
-cd ctc_decoders
-if not exist kenlm (
-    git clone https://github.com/Doubledongli/kenlm.git
-    @echo.
-)
-
-if not exist openfst-1.6.3 (
-    echo "Download and extract openfst ..."
-    git clone https://gitee.com/koala999/openfst.git
-    ren openfst openfst-1.6.3
-    @echo.
-)
-
-if not exist ThreadPool (
-    git clone https://github.com/progschj/ThreadPool.git
-    @echo.
-)
-echo "Install decoders ..."
-python setup.py install --num_processes 4
\ No newline at end of file