[PATCH] allow src/tools/msvc/clean.bat script to be called from the root of the source tree

[Juan José Santamaría Flecha]

In [1] capacity for $SUBJECT was added to most of the batch scripts, but
clean.bat was not included. I propose to do so with the attached patch.

By the way, are pgbison.bat and pgflex.bat directly called anywhere?

[1]
https://www.postgresql.org/message-id/2b7a674b-5fb0-d264-75ef-ecc7a31e5...@postgrespro.ru

Regards,

Juan José Santamaría Flecha

0001-msvc-clean-bat-path-fix.patch
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