编译失败(missing libclang_rt.builtins.a)

**【任务描述】**

repo command:

```
repo init -u git@gitee.com:openharmony/manifest.git -b master --no-repo-verify
repo sync -c
repo forall -c 'git lfs pull'
```

compile command:

```
./build.sh --product-name Hi3516DV300
```

compile output:
```
++++++++++++++++++++++++++++++++++++++++
2021-09-11 12:20:10
--product-name Hi3516DV300
build standard system...
---------------------------------------
--product-name Hi3516DV300 --device-name hi3516dv300 --target-os ohos --target-cpu arm
build_ohos_cmd: build/build_scripts/build_ohos.sh product_name=Hi3516DV300 target_os=ohos target_cpu=arm gn_args=is_standard_system=true build_target=images
++++++++++++++++++++++++++++++++++++++++
2021-09-11 12:20:11
product_name=Hi3516DV300 target_os=ohos target_cpu=arm gn_args=is_standard_system=true build_target=images
pre_process
Python 3.8.5
OPTIONS=product_name
PARAM=Hi3516DV300
-------------------
OPTIONS=target_os
PARAM=ohos
-------------------
OPTIONS=target_cpu
PARAM=arm
-------------------
OPTIONS=gn_args
PARAM=is_standard_system=true
-------------------
OPTIONS=build_target
PARAM=images
-------------------
product_name=Hi3516DV300 target_os=ohos target_cpu=arm gn_args=is_standard_system=true build_target=images
root_out_dir=//out/ohos-arm-release
root_build_dir=//out/ohos-arm-release
root_gen_dir=//out/ohos-arm-release/gen
current_toolchain=//build/toolchain/ohos:ohos_clang_arm
host_toolchain=//build/toolchain/linux:clang_x64

args: Namespace(build_platform_name='phone', build_xts=False, example_subsystem_file=None, gn_root_out_dir='/home/cbguser/project/OpenHarmony/out/ohos-arm-release', ignore_api_check=['xts', 'common', 'subsystem_examples'], platforms_config_file='/home/cbguser/project/OpenHarmony/out/build_configs/standard_system/platforms.build', scalable_build=False, source_root_dir='/home/cbguser/project/OpenHarmony/', subsystem_config_file='/home/cbguser/project/OpenHarmony/out/build_configs/subsystem_config.json', target_cpu='arm', target_os='ohos')

build configs generation is complete.
build_l2 = false
OHOS_PROFILER_DIR =  //developtools/profiler/
OHOS_PROFILER_3RDPARTY_DIR =  //third_party/
OHOS_PROFILER_3RDPARTY_GRPC_DIR =  //third_party//grpc
OHOS_PROFILER_3RDPARTY_PROTOBUF_DIR =  //third_party//protobuf
OHOS_PROFILER_3RDPARTY_GOOGLETEST_DIR //third_party//googletest
build_tests =  false
enable_debuginfo = false
enable_coverage = false
product_name : , Hi3516DV300

hi3516dv300_group in
arm
buffer manager use target:
proto_out_dir //out/ohos-arm-release/gen/cpp/developtools/profiler/protos/services gen/cpp/developtools/profiler/protos/services
proto_out_dir //out/ohos-arm-release/gen/cpp/developtools/profiler/protos/types/plugins/bytrace_plugin gen/cpp/developtools/profiler/protos/types/plugins/bytrace_plugin
build_l2 = false
OHOS_PROFILER_DIR =  //developtools/profiler/
OHOS_PROFILER_3RDPARTY_DIR =  //third_party/
OHOS_PROFILER_3RDPARTY_GRPC_DIR =  //third_party//grpc
OHOS_PROFILER_3RDPARTY_PROTOBUF_DIR =  //third_party//protobuf
OHOS_PROFILER_3RDPARTY_GOOGLETEST_DIR //third_party//googletest
build_tests =  false
enable_debuginfo = false
enable_coverage = false
----------------------------------protobuf_cc
platform: ohos
platform: ohos
platform: windows
platform: mac
platform: ohos
----------------------------------protobuf_cc
ABSEIL_DIR =  //third_party/abseil-cpp/
Done. Made 8140 targets from 1406 files in 32557ms
Starting Ninja...
python version: Python 3.8.5
build_target: images
ninja: Entering directory `/home/cbguser/project/OpenHarmony/out/ohos-arm-release'
ninja: error: '../../prebuilts/clang/ohos/linux-x86_64/llvm/lib/clang/10.0.1/lib/arm-linux-ohosmusl/libclang_rt.builtins.a', needed by 'utils/utils_base/libutilsecurec_shared.z.so', missing and no known rule to make it
build: ninja error
used: 33 seconds
pycache statistics
manage pycache contents
pycache daemon exit
post_process
```

So the main error message is:
```
ninja: error: '../../prebuilts/clang/ohos/linux-x86_64/llvm/lib/clang/10.0.1/lib/arm-linux-ohosmusl/libclang_rt.builtins.a', needed by 'utils/utils_base/libutilsecurec_shared.z.so', missing and no known rule to make it
```

Which step did I miss?
Please show me solution ASAP, thank you.

**【解决方案】**

**【任务来源】**

OpenHarmony/docs
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