Fix si-fs project on macos

[JakeGinnivan]

Added libfuse to fuser features Switch EBADFD to EBADF for cross platform bad file descriptor Pass additional link args on mac so the rust binary can link the the macfuse symbols

I've tried to not make changes which would affect linux, but don't have a linux machine at the moment so I've not tested.

nix:nix-shell-env) MacBookPro:si jake$ buck2 build //bin/si-fs
Starting new buck2 daemon...
Connected to new buck2 daemon.
[lots of warnings]
Build ID: 0655c259-4946-42e3-b5fb-e813fe62a0f3
Network: Up: 0B  Down: 26MiB
Loading targets.   Remaining     0/25     
Analyzing targets. Remaining     0/740    
Executing actions. Remaining     0/3041   
Command: build.    Finished 905 local                                                                   
Time elapsed: 2:17.2s
BUILD SUCCEEDED
(nix:nix-shell-env) MacBookPro:si jake$