build on netbsd fails

[chipitsine]

lib/vfil.c: In function 'VFIL_fsinfo':
lib/vfil.c:200:16: error: storage size of 'fsst' isn't known
200 | struct statfs fsst;
| ^~~~
lib/vfil.c:202:6: warning: implicit declaration of function 'fstatfs'; did you mean 'fstatvfs'? [-Wimplicit-function-declaration]
202 | if (fstatfs(fd, &fsst))
| ^~~~~~~
| fstatvfs
lib/vfil.c:200:16: warning: unused variable 'fsst' [-Wunused-variable]
200 | struct statfs fsst;