* Reason: statically set `${NIX_BIN_PREFIX}` within generated
`direnvrc`.
* Before it only replaced the `-z ${NIX_BIN_PREFIX:-}` check
which therefore never was `true`. So, also `NIX_BIN_PREFIX` never got
set such that its usage later always failed execution with
`NIX_BIN_PREFIX: unbound variable`. With the fix, the line containing
the check will no longer be replaced.
* Solves https://github.com/nix-community/nix-direnv/issues/70
* See also discussion on #114622
Signed-off-by: Andreas Schmid <service@aaschmid.de>
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