Git configs with core.symlinks=false breaks pyenv install

[WorldShredder]

Issue

On systems which have a global or system git config containing core.symlinks=false (e.g. Whonix, and by extension (likely) every sec-distro) the installer will fail due to .pyenv/bin/pyenv resolving to a regular file.

Solution

Add -c core.symlinks=true to the git call in checkout() in bin/pyenv-installer, and maybe take a less invasive approach by attaching it to another environment variable to make it optional. At the very least it should be noted in the README, but that involves extra, unnecessary steps for the user.

[native-api]

Add -c core.symlinks=true to the git call in checkout() in bin/pyenv-installer

Will this make later Git pulls from pyenv update work?
If yes, the solution LGTM.