fix openfst download error

speechx/cmake/openfst.cmake

@@ -4,7 +4,7 @@ set(openfst_SOURCE_DIR ${fc_patch}/openfst-src)
 set(openfst_BINARY_DIR ${fc_patch}/openfst-build)
 
 ExternalProject_Add(openfst
-  URL               https://github.com/mjansche/openfst/archive/refs/tags/1.7.2.zip
+  URL               https://paddleaudio.bj.bcebos.com/build/openfst_1.7.2.zip
   URL_HASH          SHA256=ffc56931025579a8af3515741c0f3b0fc3a854c023421472c07ca0c6389c75e6
   PREFIX            ${openfst_PREFIX_DIR} 
   SOURCE_DIR        ${openfst_SOURCE_DIR}
@@ -17,4 +17,4 @@ ExternalProject_Add(openfst
   BUILD_COMMAND     make -j 4
 )
 link_directories(${openfst_PREFIX_DIR}/lib)
-include_directories(${openfst_PREFIX_DIR}/include)
+include_directories(${openfst_PREFIX_DIR}/include)