[问题咨询]: 执行bash build.sh报错编译4.1源码报错

### 问题描述

ubuntu 22.04.4 python为conda 3.11.4
uname -a : Linux vision-virtual-machine 6.5.0-18-generic #18~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Wed Feb  7 11:40:03 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
拉取完 OpenHarmony 4.1源码后，执行如下：
bash build/prebuilts_download.sh
bash build.sh报错
[OHOS ERROR] ERROR at //third_party/ffmpeg/BUILD.gn:1708:17 (//build/toolchain/mingw:mingw_x86_64): Empty directory path.

[OHOS ERROR]     rebase_path(sysroot, root_build_dir),

[OHOS ERROR]                 ^------

[OHOS ERROR] You can't use empty strings as directories.

[OHOS ERROR] See //foundation/multimedia/image_framework/interfaces/innerkits/BUILD.gn:186:9: which caused the file to be included.

[OHOS ERROR]         "//third_party/ffmpeg:libohosffmpeg_static",

[OHOS ERROR]         ^------------------------------------------

[OHOS ERROR] current_cpu = x64

[OHOS ERROR] current_os = linux

[OHOS ERROR] host_os = linux

[OHOS ERROR] is_mingw = false

[OHOS ERROR] ffmpeg selected cplatform

[OHOS ERROR] imf_enable:  true

[OHOS ERROR] display_composer

[OHOS ERROR] bundle_framework_power_mgr_enable = true

[OHOS ERROR] bundle_framework_graphics = true

[OHOS ERROR] bundle_framework_free_install = false

[OHOS ERROR] bundle_framework_default_app = true

[OHOS ERROR] bundle_framework_launcher = true

[OHOS ERROR] bundle_framework_sandbox_app = true

[OHOS ERROR] bundle_framework_quick_fix = true

[OHOS ERROR] bundle_framework_app_control = true

[OHOS ERROR] distributed_bundle_framework = true

[OHOS ERROR] ability_runtime_enable = true

[OHOS ERROR] account_enable = true

[OHOS ERROR] configpolicy_enable = false

[OHOS ERROR] global_resmgr_enable = true

[OHOS ERROR] hicollie_enable = true

[OHOS ERROR] support_jsapi = true

[OHOS ERROR] hisysevent_enable = true

[OHOS ERROR] bundle_framework_overlay_install = true

[OHOS ERROR] bundle_framework_bundle_resource = true

[OHOS ERROR] verify_abc_enabled = true