"does not contain the arm64 architecture" form static x264 lib

[Eafy]

Environment：

• Mac：MacOS Catalina 10.15.5
• Xcode: 10.1 and 11.5
• FFmpeg: 4.2
• x264: x264-snapshot-20180426-2245

Problem：

• ffbuild/config.log：

ld: warning: ignoring file /Users/test/Desktop/FFmpegiOS/4.2/x264-iOS/lib/libx264.a, file is universal (5 slices) but does not contain the arm64 architecture: /Users/test/Desktop/FFmpegiOS/4.2/x264-iOS/lib/libx264.a
Undefined symbols for architecture arm64:
"_x264_encoder_encode", referenced from:
_check_x264_encoder_encode in test.o
(maybe you meant: _check_x264_encoder_encode)
ld: symbol(s) not found for architecture arm64

• x264 libs:

/Users/test/Desktop/FFmpegiOS/4.2/x264-iOS/lib/libx264.a (for architecture i386)current ar archive
/Users/test/Desktop/FFmpegiOS/4.2/x264-iOS/lib/libx264.a (for architecture armv7): current ar archive
/Users/test/Desktop/FFmpegiOS/4.2/x264-iOS/lib/libx264.a (for architecture armv7s): current ar archive
/Users/test/Desktop/FFmpegiOS/4.2/x264-iOS/lib/libx264.a (for architecture x86_64): current ar archive
/Users/test/Desktop/FFmpegiOS/4.2/x264-iOS/lib/libx264.a (for architecture arm64): current ar archive

• My idea：

1. No problem in macOS 10.4 builed；
2. Only builed of ffmpeg is also shows 'current ar archive', is no 'current ar archive random library'；

Is there any parameter that needs to be added on the macOS 10.15.* build?