fix(build): gate ops --whole-archive link on WITH_ASCEND

`src/CMakeLists.txt:442` referenced `no_workspace_kernel` /
`no_workspace_kernel_build` from inside `if(GENERATE_PYTHON_BINDINGS)`
without checking `WITH_ASCEND`.  Those targets are only created in the
`WITH_ASCEND` block above (244-309), so non-Ascend
`pip install -e .[dev]` failed at CMake configure with `No target
"no_workspace_kernel"` and `dependency target "no_workspace_kernel_build"
does not exist`.

Mirror the gate: `if(WITH_ASCEND AND BUILD_ASCEND_CUSTOM)`.

Verified non-Ascend (`-DWITH_ASCEND=OFF -DWITH_CPU=ON`) and Ascend
(auto-detect) configure both pass.

Author: zhangyue

src/CMakeLists.txt

@@ -438,8 +438,12 @@ if(GENERATE_PYTHON_BINDINGS)
     # `aclrtlaunch_*` live in `ops.cc`, so link here with
     # `--whole-archive` to ensure all launch functions are available.
     # `$<TARGET_FILE>` works for both real `ascendc_library()` targets and
-    # `IMPORTED` targets pointing at a pre-built `.a`.
-    if(BUILD_ASCEND_CUSTOM)
+    # `IMPORTED` targets pointing at a pre-built `.a`.  The
+    # `no_workspace_kernel` target is only created inside the
+    # `WITH_ASCEND` block above, so this branch must mirror that gate;
+    # otherwise non-Ascend builds error out with "No target
+    # no_workspace_kernel".
+    if(WITH_ASCEND AND BUILD_ASCEND_CUSTOM)
         target_link_libraries(ops PRIVATE
             -Wl,--whole-archive $<TARGET_FILE:no_workspace_kernel> -Wl,--no-whole-archive)
         # `ops` link step must wait for `build.sh` to produce the `.a`.