Introduce a TAP_TESTS_PERL primitive to list test programs written in perl.
Only do this in tap.test.mk because I only expect perl-based test programs
with this interface.
This is very similar to TAP_TESTS_SH but the difference is that we record
in the Kyuafile that the test program requires a perl interpreter. This
in turn makes Kyua mark the test as skipped if the perl package is not yet
installed, instead of mysteriously failing to run the program.
MFC after: 5 days
This file provides support to build test programs that comply with the
Test Anything Protocol. Its main goal is to support the painless
integration of existing tests from tools/regression/ into the Kyua-based
test suite.
Approved by: rpaulo (mentor)
