audio/py-essentia: fix build

Correct the previous fix to make it actually work.

Reported by:	yuri (maintainer)
Pointy hat to:  rm

audio/py-essentia/Makefile

@@ -1,7 +1,7 @@
 PORTNAME=	essentia
 DISTVERSIONPREFIX=	v
 DISTVERSION=	2.1_beta5-859
-PORTREVISION=	3
+PORTREVISION=	4
 DISTVERSIONSUFFIX=	-gb247091f
 CATEGORIES=	audio
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}
@@ -20,8 +20,9 @@ RUN_DEPENDS=	${PYNUMPY} \
 		${PYTHON_PKGNAMEPREFIX}six>0:devel/py-six@${PY_FLAVOR} \
 		${PYTHON_PKGNAMEPREFIX}yaml>0:devel/py-yaml@${PY_FLAVOR}
 
-PATCH_SITES=	https://raw.githubusercontent.com/MTG/essentia/d02b6c752046802a711530e2bcd5feafca42247d/
-PATCH_FILES=	waf
+MASTER_SITES=	https://raw.githubusercontent.com/MTG/essentia/d02b6c752046802a711530e2bcd5feafca42247d/
+DISTFILES=	waf
+EXTRACT_ONLY=	${GH_ACCOUNT}-${PORTNAME}*.gz
 
 USES=		eigen:3 pkgconfig python
 USE_PYTHON=	pytest