Symlinks in a root dir cause projector to miss repos

[chasinglogic]

Without symlinks:

@rocinante ➜  Work projector list | grep Work
/Users/chasinglogic/Work/kernel-tools
/Users/chasinglogic/Work/wiredtiger
/Users/chasinglogic/Work/scons
/Users/chasinglogic/Work/toolchain-builder
/Users/chasinglogic/Work/zlib
/Users/chasinglogic/Work/llvm-project
/Users/chasinglogic/Work/nixpkgs
/Users/chasinglogic/Work/buildhost-configuration
/Users/chasinglogic/Work/mongo
/Users/chasinglogic/Work/employees
@rocinante ➜  Work

With a symlink of toolchain-linked -> toolchain-builder:

@rocinante ➜  Work projector list | grep Work
/Users/chasinglogic/Work/kernel-tools
/Users/chasinglogic/Work/wiredtiger
/Users/chasinglogic/Work/scons
/Users/chasinglogic/Work/toolchain-builder
/Users/chasinglogic/Work/zlib
/Users/chasinglogic/Work/llvm-project
/Users/chasinglogic/Work/nixpkgs
/Users/chasinglogic/Work/buildhost-configuration
/Users/chasinglogic/Work/toolchain-linked
@rocinante ➜  Work

Note that mongo and employees is now missing.