ci: Cache wxWidgets on Windows
ci: Cache wxWidgets on Windows

This shaves off ~7min from build time.

We put `~/wxWidgets`, as opposed to `/mnt/c/opt/local64/pgm/wxWidgets-*`.
With the latter, restoring the cache silently fails.

ferd/otp,getong/otp,bjorng/otp,bjorng/otp,erlang/otp,erlang/otp,g-andrade/otp,mikpe/otp,emacsmirror/erlang,erlang/otp,potatosalad/otp,isvilen/otp,emacsmirror/erlang,erlang/otp,g-andrade/otp,dgud/otp,potatosalad/otp,ferd/otp,dgud/otp,emacsmirror/erlang,g-andrade/otp,isvilen/otp,uabboli/otp,rlipscombe/otp,g-andrade/otp,dgud/otp,mikpe/otp,bjorng/otp,getong/otp,uabboli/otp,getong/otp,dumbbell/otp,g-andrade/otp,jj1bdx/otp,bjorng/otp,mikpe/otp,rlipscombe/otp,uabboli/otp,potatosalad/otp,jj1bdx/otp,isvilen/otp,isvilen/otp,dumbbell/otp,jj1bdx/otp,isvilen/otp,vinoski/otp,jj1bdx/otp,isvilen/otp,dgud/otp,erlang/otp,getong/otp,emacsmirror/erlang,mikpe/otp,potatosalad/otp,vinoski/otp,jj1bdx/otp,mikpe/otp,mikpe/otp,potatosalad/otp,dumbbell/otp,mikpe/otp,ferd/otp,jj1bdx/otp,dgud/otp,ferd/otp,g-andrade/otp,g-andrade/otp,potatosalad/otp,bjorng/otp,vinoski/otp,uabboli/otp,getong/otp,mikpe/otp,jj1bdx/otp,vinoski/otp,isvilen/otp,getong/otp,rlipscombe/otp,isvilen/otp,rlipscombe/otp,mikpe/otp,bjorng/otp,emacsmirror/erlang,dgud/otp,uabboli/otp,bjorng/otp,g-andrade/otp,vinoski/otp,isvilen/otp,ferd/otp,emacsmirror/erlang,dumbbell/otp,rlipscombe/otp,erlang/otp,erlang/otp,uabboli/otp,dgud/otp,potatosalad/otp,ferd/otp,erlang/otp,g-andrade/otp,uabboli/otp,ferd/otp,emacsmirror/erlang,jj1bdx/otp,isvilen/otp,ferd/otp,dgud/otp,emacsmirror/erlang,bjorng/otp,potatosalad/otp,rlipscombe/otp,dumbbell/otp,vinoski/otp,dumbbell/otp,potatosalad/otp,uabboli/otp,rlipscombe/otp,vinoski/otp,vinoski/otp,rlipscombe/otp,vinoski/otp,rlipscombe/otp,g-andrade/otp,getong/otp,bjorng/otp,jj1bdx/otp,erlang/otp,vinoski/otp,getong/otp,dgud/otp,potatosalad/otp,dumbbell/otp,dumbbell/otp,getong/otp,uabboli/otp,ferd/otp,emacsmirror/erlang,mikpe/otp,erlang/otp,jj1bdx/otp,dumbbell/otp,bjorng/otp,dumbbell/otp,rlipscombe/otp,emacsmirror/erlang,getong/otp,dgud/otp