android lib build failed under macos

[savvytang]

I'm using main branch.

[ 41%] Building C object CMakeFiles/ktx.dir/lib/writer1.c.o
[ 42%] Building C object CMakeFiles/ktx.dir/lib/writer2.c.o
[ 42%] Linking CXX shared library libktx.dylib
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a23': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a22': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a21': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a20': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a19': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a18': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a17': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a16': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a15': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a14': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a13': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a12': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a11': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a10': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a9': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a8': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a7': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a6': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a5': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a4': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a3': found architecture 'arm64', required architecture 'x86_64'
ld: warning: ignoring file 'external/astc-encoder/Source/libastcenc-neon-static.a2': found architecture 'arm64', required architecture 'x86_64'
Undefined symbols for architecture x86_64:
"astcenc_config_init(astcenc_profile, unsigned int, unsigned int, unsigned int, float, unsigned int, astcenc_config*)", referenced from:
_ktxTexture2_CompressAstcEx in astc_encode.cpp.o
"astcenc_context_free(astcenc_context*)", referenced from:
_ktxTexture2_CompressAstcEx in astc_encode.cpp.o
_ktxTexture2_CompressAstcEx in astc_encode.cpp.o
"astcenc_context_alloc(astcenc_config const*, unsigned int, astcenc_context**)", referenced from:
_ktxTexture2_CompressAstcEx in astc_encode.cpp.o
"astcenc_compress_image(astcenc_context*, astcenc_image*, astcenc_swizzle const*, unsigned char*, unsigned long, unsigned int)", referenced from:
_ktxTexture2_CompressAstcEx in astc_encode.cpp.o
compressionWorkloadRunner(int, int, void*) in astc_encode.cpp.o
"astcenc_compress_reset(astcenc_context*)", referenced from:
_ktxTexture2_CompressAstcEx in astc_encode.cpp.o
"astcenc_get_error_string(astcenc_error)", referenced from:
_ktxTexture2_CompressAstcEx in astc_encode.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [libktx.4.3.2.dylib] Error 1
make[1]: *** [CMakeFiles/ktx.dir/all] Error 2
make: *** [all] Error 2