sysutils/fusefs-sshfs: warnings and readdir() fix

Merge upstreqam patches:

• https://github.com/libfuse/sshfs/issues/211
• https://github.com/libfuse/sshfs/issues/212
• https://github.com/libfuse/sshfs/issues/278

PR: 264607
Reported by: rozhuk.im@gmail.com