remove ONNX & Turn on NO_API for mobile build (#23546)

Summary:
### Summary
The iOS build was broken after this PR 👉 [23195](https://github.com/pytorch/pytorch/pull/23195/files) was merged, as there are two files still have dependency on ONNX.
- `test.cpp` in `test/cpp/jit`
-  `export.cpp` in `torch/csrc/jit`

This PR is to remove ONNX completely from mobile build.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23546

Test Plan:
- The `build_ios.sh` finished successfully.
- The `libtorch.a` can  be compiled and run on iOS devices

Differential Revision: D16558236

Pulled By: xta0

fbshipit-source-id: b7ff1db750698cfd5a72d5cb0b9f2f378e315077

CMakeLists.txt

@@ -221,6 +221,7 @@ if (INTERN_BUILD_MOBILE AND NOT BUILD_CAFFE2_MOBILE)
   set(BUILD_CAFFE2_OPS OFF)
   set(USE_DISTRIBUTED OFF)
   set(FEATURE_TORCH_MOBILE ON)
+  set(NO_API ON)
 endif()
 
 if (BUILD_ATEN_ONLY)

caffe2/CMakeLists.txt

@@ -366,7 +366,6 @@ if (NOT INTERN_BUILD_MOBILE OR NOT BUILD_CAFFE2_MOBILE)
     ${TORCH_SRC_DIR}/csrc/jit/autodiff.cpp
     ${TORCH_SRC_DIR}/csrc/jit/attributes.cpp
     ${TORCH_SRC_DIR}/csrc/jit/argument_spec.cpp
-    ${TORCH_SRC_DIR}/csrc/jit/export.cpp
     ${TORCH_SRC_DIR}/csrc/jit/pass_manager.cpp
     ${TORCH_SRC_DIR}/csrc/jit/pickler.cpp
     ${TORCH_SRC_DIR}/csrc/jit/graph_executor.cpp
@@ -430,7 +429,6 @@ if (NOT INTERN_BUILD_MOBILE OR NOT BUILD_CAFFE2_MOBILE)
     ${TORCH_SRC_DIR}/csrc/jit/register_special_ops.cpp
     ${TORCH_SRC_DIR}/csrc/jit/scope.cpp
     ${TORCH_SRC_DIR}/csrc/jit/script/compiler.cpp
-    ${TORCH_SRC_DIR}/csrc/api/src/jit.cpp
     ${TORCH_SRC_DIR}/csrc/jit/testing/file_check.cpp
     ${TORCH_SRC_DIR}/csrc/jit/script/convert_to_ssa.cpp
     ${TORCH_SRC_DIR}/csrc/jit/script/exit_transforms.cpp
@@ -457,14 +455,19 @@ if (NOT INTERN_BUILD_MOBILE OR NOT BUILD_CAFFE2_MOBILE)
     ${TORCH_SRC_DIR}/csrc/jit/fuser/codegen.cpp
     ${TORCH_SRC_DIR}/csrc/jit/fuser/fallback.cpp
     ${TORCH_SRC_DIR}/csrc/jit/function.cpp
-    ${TORCH_ROOT}/test/cpp/jit/test.cpp
     )
 
-  if (NOT WIN32 AND NOT INTERN_BUILD_MOBILE)
-    list(APPEND TORCH_SRCS
-      ${TORCH_SRC_DIR}/csrc/jit/fuser/cpu/fused_kernel.cpp
+  if (NOT INTERN_BUILD_MOBILE)
+    list(APPEND TORCH_SRCS 
+      ${TORCH_SRC_DIR}/csrc/api/src/jit.cpp
+      ${TORCH_SRC_DIR}/csrc/jit/export.cpp
+      ${TORCH_ROOT}/test/cpp/jit/test.cpp
     )
-  endif ()
+    if (NOT WIN32)
+      list(APPEND TORCH_SRCS 
+        ${TORCH_SRC_DIR}/csrc/jit/fuser/cpu/fused_kernel.cpp)
+    endif()
+  endif()
 
   if (USE_CUDA)
     if (NOT USE_ROCM)