fuse: 2.9.7 -> 2.9.8 (security, CVE-2018-10906)

Upstream changelog:
- SECURITY UPDATE: In previous versions of libfuse it was possible to
  for unprivileged users to specify the allow_other option even when
  this was forbidden in /etc/fuse.conf. The vulnerability is present
  only on systems where SELinux is active (including in permissive
  mode).
- libfuse no longer segfaults when fuse_interrupted() is called outside
  the event loop.
- The fusermount binary has been hardened in several ways to reduce
  potential attack surface. Most importantly, mountpoints and mount
  options must now match a hard-coded whitelist. It is expected that
  this whitelist covers all regular use-cases.
- Fixed rename deadlock on FreeBSD.

pkgs/os-specific/linux/fuse/default.nix

@@ -6,8 +6,8 @@ let
   };
 in {
   fuse_2 = mkFuse {
-    version = "2.9.7";
-    sha256Hash = "1wyjjfb7p4jrkk15zryzv33096a5fmsdyr2p4b00dd819wnly2n2";
+    version = "2.9.8";
+    sha256Hash = "0s04ln4k9zvvbjih8ybaa19fxg8xv7dcsz2yrlbk35psnf3l67af";
   };
 
   fuse_3 = mkFuse {