net/libnfs: fix build error regarding "redefinition of typedef" libnfs was redefining u_int, causing programs using libnfs to get "error: redefinition of typedef 'u_int' is a C11 feature" errors. Upstream PR: https://github.com/sahlberg/libnfs/pull/326 PR: 248296 Approved by: Shannon Noe <snoe925@gmail.com> (maintainer)