Re: [PATCH v3 3/3] connect: improve check for plink to reduce false positives

> The git_connect function has code to handle plink and tortoiseplink
> specially, as they require different command line arguments from
> OpenSSH (-P instead of -p for ports; tortoiseplink additionally requires
> -batch).  However, the match was done by checking for "plink" anywhere
> in the string, which led to a GIT_SSH value containing "uplink" being
> treated as an invocation of putty's plink.
> 
> Improve the check by looking for "plink" or "tortoiseplink" (or those
> names suffixed with ".exe") only in the final component of the path.
> This has the downside that a program such as "plink-0.63" would no
> longer be recognized, but the increased robustness is likely worth it.
> Add tests to cover these cases to avoid regressions.
> 
> Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>