remove mypy which blocks release. (onnx#1031)

CMakeLists.txt

@@ -12,7 +12,6 @@ project(onnx C CXX)
 option(ONNX_BUILD_BENCHMARKS "Build ONNX micro-benchmarks" OFF)
 
 option(BUILD_ONNX_PYTHON "Build Python binaries" OFF)
-option(ONNX_GEN_PB_TYPE_STUBS "Generate protobuf python type stubs" ON)
 option(ONNX_WERROR "Build with Werror" OFF)
 option(ONNX_COVERAGE "Build with coverage instrumentation" OFF)
 option(ONNX_BUILD_TESTS "Build ONNX C++ APIs Tests" OFF)
@@ -179,12 +178,6 @@ function(RELATIVE_PROTOBUF_GENERATE_CPP NAME SRCS HDRS ROOT_DIR DEPEND)
     set(PROTOC_ARGS ${GENERATED_PROTO} -I ${OUTPUT_PROTO_DIR} --cpp_out ${ONNX_DLLEXPORT_STR}${OUTPUT_PROTO_DIR})
     if(BUILD_ONNX_PYTHON)
       list(APPEND PROTOC_ARGS --python_out ${ONNX_DLLEXPORT_STR}${OUTPUT_PROTO_DIR})
-      if(ONNX_GEN_PB_TYPE_STUBS)
-        if(NOT WIN32)
-          # Haven't figured out how to generate mypy stubs on Windows yet
-          list(APPEND PROTOC_ARGS --plugin protoc-gen-mypy=${ROOT_DIR}/tools/protoc-gen-mypy.py --mypy_out ${ONNX_DLLEXPORT_STR}${OUTPUT_PROTO_DIR})
-        endif()
-      endif()
     endif()
     if (NOT ONNX_PROTOC_EXECUTABLE)
         message(FATAL_ERROR "Protobuf compiler not found")