Depend on pkgnames and not files, always better.

Sponsored by:	Absolight

Mk/Uses/python.mk

@@ -661,8 +661,8 @@ CMAKE_ARGS+=	-DPython_ADDITIONAL_VERSIONS=${PYTHON_VER}
 
 # Python 3rd-party modules
 PYGAME=		${PYTHON_PKGNAMEPREFIX}game>0:devel/py-game@${PY_FLAVOR}
-PYNUMERIC=	${PYTHON_SITELIBDIR}/Numeric/Numeric.py:math/py-numeric@${PY_FLAVOR}
-PYNUMPY=	${PYTHON_SITELIBDIR}/numpy/core/numeric.py:math/py-numpy@${PY_FLAVOR}
+PYNUMERIC=	${PYTHON_PKGNAMEPREFIX}numeric>0:math/py-numeric@${PY_FLAVOR}
+PYNUMPY=	${PYTHON_PKGNAMEPREFIX}numpy>0:math/py-numpy@${PY_FLAVOR}
 
 # Common Python modules that can be needed but only for some versions of Python.
 .if ${PYTHON_REL} < 3400