libc: Fix TESTSDIR for new stdbit tests

Otherwise the directory created by etc/mtree/BSD.tests.dist, which is
where these belong, and referred to by the generated Kyuafile for
/usr/tests/lib/libc (v

libc: Fix TESTSDIR for new stdbit tests

Otherwise the directory created by etc/mtree/BSD.tests.dist, which is
where these belong, and referred to by the generated Kyuafile for
/usr/tests/lib/libc (via stdbit's existence in TESTS_SUBDIRS), ends up
empty with no Kyuafile, which is an error for kyua.

Reported by: kp
Fixes: 2fb8cbc6ef1b ("libc/tests: add stdbit test framework and unit tests")

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libc/tests: add stdbit test framework and unit tests

This adds unit tests for all 70 functions in <stdbit.h>.

I'm sorry for the test framework, but it makes it so I don't
have to write 70 unit test

libc/tests: add stdbit test framework and unit tests

This adds unit tests for all 70 functions in <stdbit.h>.

I'm sorry for the test framework, but it makes it so I don't
have to write 70 unit tests by hand.

Reviewed by: adrian, des
Approved by: markj (mentor)
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D53660

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