gifslice pre-build test failed

Under normal circumstances, raw.githubusercontent.com cannot be connected

Solution:
Open http://tool.chinaz.com/dns, which is a tool for
querying the mapping of domain names. Query the IP corresponding to raw.githubusercontent.com, as in the example below,
and then open the local
C:\Windows\System32 \drivers\etc\hosts file
add
185.199.110.133 raw.githubusercontent.com