t6132(NO_PERL): do not run the scripted `add -p`

t6132(NO_PERL): do not run the scripted `add -p`

When using the non-built-in version of `git add -p` in a `NO_PERL`
build, we expect that invocation to fail.

However, when b02fdbc80a4 (pathspec: correct an empty string used as a
pathspec element, 2022-05-29) added a test case to t6132 to exercise
`git add -p`, it did not add appropriate prereqs (which admittedly did
not exist back then).

Let's specify the appropriate prereqs.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>