getting tons of warnings on macos/arm build

[xoba]

they look like this:

# github.com/adrium/goheif/libde265
In file included from libde265.cc:2:
In file included from ./libde265-all.inl:45:
../gopath/pkg/mod/github.com/adrium/goheif@v0.0.0-20230113233934-ca402e77a786/libde265/libde265/x86/sse-motion.cc:3530:68: warning: implicit conversion from 'int' to 'short' changes value from 65535 to -1 [-Wconstant-conversion]
../gopath/pkg/mod/github.com/adrium/goheif@v0.0.0-20230113233934-ca402e77a786/libde265/libde265/x86/sse-motion.cc:3530:58: warning: implicit conversion from 'int' to 'short' changes value from 65535 to -1 [-Wconstant-conversion]
../gopath/pkg/mod/github.com/adrium/goheif@v0.0.0-20230113233934-ca402e77a786/libde265/libde265/x86/sse-motion.cc:3530:48: warning: implicit conversion from 'int' to 'short' changes value from 65535 to -1 [-Wconstant-conversion]
../gopath/pkg/mod/github.com/adrium/goheif@v0.0.0-20230113233934-ca402e77a786/libde265/libde265/x86/sse-motion.cc:3530:38: warning: implicit conversion from 'int' to 'short' changes value from 65535 to -1 [-Wconstant-conversion]

and they go on and on and on, many more lines.