sysutils/py-ansible-compat: Set TMPDIR to ${WRKSRC}

Ensure pytest temporary files are created under ${WRKSRC} so the
testing files will be cleaned up by `make clean`.  Otherwise this can
leave a tree of hundreds of files under /tmp.

sysutils/py-ansible-compat/Makefile

@@ -28,7 +28,7 @@ TEST_DEPENDS=	${PYTHON_PKGNAMEPREFIX}coverage>0:devel/py-coverage@${PY_FLAVOR} \
 USES=		python:3.9+
 USE_PYTHON=	autoplist pep517 pytest
 
-TEST_ENV=	LC_ALL=C.UTF-8 PYTHONPATH=${WRKSRC}/src
+TEST_ENV=	LC_ALL=C.UTF-8 PYTHONPATH=${WRKSRC}/src TMPDIR=${WRKDIR}/
 
 NO_ARCH=	yes