[9fans] Bug: Acme: Acme mangles $PATH on Linux

[9fans] Bug: Acme: Acme mangles $PATH on Linux

[kalterdev]

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Expected behavior

Acme shouldn't touch $PATH.

Unexpected behavior

It adds the path of plan9port binaries to the beginning of the PATH.

Thus, Acme runs Plan 9 programs by default, which is contrary to
plan9port's stated recommendation to put the path of the binaries to
the end of PATH:

> . . . it is not recommended to put $PLAN9/bin before the usual
> system bin directories in your search path. Instead, put it at the
> end of your path and use the 9(1) script when you want to invoke the
> Plan 9 version of a traditional Unix command.

https://9fans.github.io/plan9port/man/man1/intro.html

Steps to reproduce the problem

Run Acme on Linux.

plan9port version

20240617-1, from the official Arch Linux repos.

OS version

Arch Linux

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