fstat doesn't return S_IFSOCK for wasi:socket handles

[pavelsavara]

wasi-libc/libc-bottom-half/cloudlibc/src/libc/sys/stat/fstat.c

Lines 12 to 21 in 7d4d3b8

	int fstat(int fildes, struct stat *buf) {
	__wasi_filestat_t internal_stat;
	__wasi_errno_t error = __wasi_fd_filestat_get(fildes, &internal_stat);
	if (error != 0) {
	errno = error;
	return -1;
	}
	to_public_stat(&internal_stat, buf);
	return 0;
	}

[abrown]

cc: @badeend, @dicej