sysutils/fusefs-encfs: Update to 1.9.4

Change log: https://github.com/vgough/encfs/releases/tag/v1.9.4

Port changes [1]:

• Fix compilation with "-std=c++11"
• Fix a gid permission issue with allow_other
• Fix operations on symlinks
• Fix a race in idle unmount
• Add --reversewrite cli option
• Add PID to syslog logging
• Deep code sanity check
• Modernize coding style
• Make codebase warnings & clang-tidy clean
• Bump FUSE_USE_VERSION to 29
• Ensure compatibility with LibreSSL
• Switch to vendored lib tinyxml2 & easylogging
• Reorganize man page and add missing options
• Add gtest and micro benchmarks
• Fix packaging error leading to wrong version output
• Fix shared lib compilation (cmake -DBUILD_SHARED_LIBS=ON ..)

[1] https://github.com/vgough/encfs/releases

PR: 225534
Submitted by: Dmitri Goutnik <dg@syrec.org> (maintainer)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D14124